# Asami Chiba

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{{Short description|Japanese sprinter (born 1985)}}
{{About|the sprinter formerly known as "Asami Tanno"|the voice actress|Asami Tano}}
{{MedalTableTop
| sport = Women's [athletics](/source/athletics_(sport))
| country_code = JPN
| medals =
{{Medal|Competition | [Asian Championships](/source/Asian_Athletics_Championships) }}
{{Medal|Gold | [2009 Guangzhou](/source/2009_Asian_Athletics_Championships) | [400 m](/source/2009_Asian_Athletics_Championships_%E2%80%93_Women's_400_metres) }}
{{Medal|Silver | [2007 Amman](/source/2007_Asian_Athletics_Championships) | [400 m](/source/2007_Asian_Athletics_Championships_%E2%80%93_Women's_400_metres) }}
{{Medal|Silver | [2007 Amman](/source/2007_Asian_Athletics_Championships) | [4 × 400 m relay](/source/2007_Asian_Athletics_Championships_%E2%80%93_Women's_4_%C3%97_400_metres_relay) }}
{{Medal|Bronze | [2005 Incheon](/source/2005_Asian_Athletics_Championships) | [400 m](/source/2005_Asian_Athletics_Championships_%E2%80%93_Women's_400_metres) }}
{{Medal|Bronze | [2005 Incheon](/source/2005_Asian_Athletics_Championships) | [4 × 400 m relay](/source/2005_Asian_Athletics_Championships_%E2%80%93_Women's_4_%C3%97_400_metres_relay) }}
{{Medal|Bronze | [2009 Guangzhou](/source/2009_Asian_Athletics_Championships) | [4 × 400 m relay](/source/2009_Asian_Athletics_Championships_%E2%80%93_Women's_4_%C3%97_400_metres_relay) }}
{{Medal|Competition | [Asian Indoor Championships](/source/Asian_Indoor_Athletics_Championships) }}
{{Medal|Bronze | [2004 Tehran](/source/2004_Asian_Indoor_Athletics_Championships) | [200 m](/source/2004_Asian_Indoor_Athletics_Championships_%E2%80%93_Results) }}
{{Medal|Competition | [Asian Games](/source/Asian_Games) }}
{{Medal|Bronze | [2006 Doha](/source/2006_Asian_Games) | [400 m](/source/Athletics_at_the_2006_Asian_Games_%E2%80%93_Women's_400_metres) }}
{{Medal|Competition | [East Asian Games](/source/East_Asian_Games) }}
{{Medal|Gold | [2005 Macau](/source/2005_East_Asian_Games) | [400 m](/source/Athletics_at_the_2005_East_Asian_Games) }}
}}

{{Nihongo|'''Asami Chiba'''|千葉 麻美|Chiba Asami|born 25 September 1985}}, or '''Tanno''', is a Japanese [sprinter](/source/sprint_(running)) who specialises in the [400 metres](/source/400_metres). She is the [Japanese record](/source/List_of_Japanese_records_in_athletics) holder in the event, and has also broken the national record in the [4×400 metres relay](/source/4%C3%97400_metres_relay) on multiple occasions. She is a member of Natureal Athlete Club in Japan and is coached by Kazuhisa Kawamoto.<ref>[http://www.natureal.co.jp/nac/profile/asami-tanno.html Asami Chiba] {{webarchive |url=https://web.archive.org/web/20091114143740/http://www.natureal.co.jp/nac/profile/asami-tanno.html |date=November 14, 2009 }}. Natureal Athlete Club. Retrieved on 2009-09-27.</ref>

As a junior athlete, Tanno won two silver medals at the [Asian Junior Athletics Championships](/source/Asian_Junior_Athletics_Championships), setting a national record in 2004, and she also reached the final of the [World Junior Championships](/source/2004_World_Junior_Championships_in_Athletics). She competed at her first [World Championships](/source/World_Championships_in_Athletics) the following year and won two bronze medals at the [Asian Championships](/source/2005_Asian_Championships_in_Athletics). In the 2006 and 2007 seasons, she won bronze at the [2006 Asian Games](/source/2006_Asian_Games) and two silver medals at the Asian Championships. She also helped set a new national relay record and became Japan's first ever female sprint semi-finalist at the [2007 World Championships](/source/2007_World_Championships_in_Athletics). She was less successful at the [2008 Beijing Olympics](/source/2008_Beijing_Olympics) and [2009 World Championships](/source/2009_World_Championships_in_Athletics) as she was eliminated in the heats at both events.

A five-time national champion in the 400&nbsp;m, she has only lost once in the event at the Japanese championships, to [Satomi Kubokura](/source/Satomi_Kubokura). She mainly competes on the [Japanese athletics circuit](/source/Athletics_in_Japan), running at the [Osaka Grand Prix](/source/Osaka_Grand_Prix), [Shizuoka International](/source/Shizuoka_International) and the Super Meet in [Kawasaki](/source/Kawasaki%2C_Kanagawa).

==Career==

===National champion and records===
A native of [Yabuki, Fukushima](/source/Yabuki%2C_Fukushima),<ref>[https://web.archive.org/web/20200417211921/https://www.sports-reference.com/olympics/athletes/ta/asami-tanno-1.html Biography and Statistics Asami Tanno]. Sports Reference. Retrieved on 2009-09-23.</ref> Asami Tanno won her first international medals at the [2002 Asian Junior Athletics Championships](/source/2002_Asian_Junior_Athletics_Championships), taking the 400&nbsp;m silver behind [Sathi Geetha](/source/Sathi_Geetha) and a bronze with the Japanese [relay team](/source/relay_race).<ref>[http://www.asianathletics.org/results/ajc-results.htm Asian Junior Championships results] {{webarchive |url=https://web.archive.org/web/20090926142033/http://www.asianathletics.org/results/ajc-results.htm |date=September 26, 2009 }}. [Asian Athletics Association](/source/Asian_Athletics_Association). Retrieved on 2009-09-23.</ref> After making significant improvements upon her 2003 performances,<ref>Nakamura, Ken (2005-06-01). [http://www.iaaf.org/news/Kind=2/newsId=29598.html Murofushi, Suetsugu and many more to compete in Japanese National Championships – PREVIEW]. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref> she came to prominence at the [2004 Asian Junior Athletics Championships](/source/2004_Asian_Junior_Athletics_Championships) in [Ipoh](/source/Ipoh). She set a [Japanese record](/source/List_of_Japanese_records_in_athletics) in the 400&nbsp;m with 52.88&nbsp;seconds,<ref name=Ken1>Nakamura, Ken (2005-06-06). [http://www.iaaf.org/news/Kind=2/newsId=29666.html Tanno sets national 400m record – Japanese National Championships – Day 4]. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref> a time that is still the national junior record.<ref>[http://www.rikuren.or.jp/english/junior_national/index.html JAPAN National Junior Records] {{webarchive |url=https://web.archive.org/web/20091006060542/http://www.rikuren.or.jp/english/junior_national/index.html |date=October 6, 2009 }}. [Japan Association of Athletics Federations](/source/Japan_Association_of_Athletics_Federations). Retrieved on 2009-09-23.</ref> She also ran in the [4×100 metres relay](/source/4%C3%97100_metres_relay), winning her first international gold medal.<ref name=Champs /><ref name=JAAF>[http://www.rikuren.or.jp/fan/player/wom0026.html Asami Tanno Profile] {{webarchive |url=https://web.archive.org/web/20090924091058/http://www.rikuren.or.jp/fan/player/wom0026.html |date=September 24, 2009 }}. [JAAF](/source/Japan_Association_of_Athletics_Federations). Retrieved on 2009-09-23.</ref>

Further success came at scholastic level, as she set championship records to win the 200&nbsp;m and 400&nbsp;m at the Japanese Inter-Collegiate Championships.<ref>Nakamura, Ken (2005-07-06). [http://www.iaaf.org/news/newsid=30126.html Japan – National Inter-Collegiate Championships]. [IAAF](/source/IAAF). Retrieved on 2010-08-08.</ref> She won a bronze medal in the [200 metres](/source/200_metres) at the [Asian Indoor Athletics Championships](/source/Asian_Indoor_Athletics_Championships) and won the 400&nbsp;m events at both the [Japanese National Games](/source/Japanese_National_Games) (''Kokutai'') and the national championships that year.<ref name=Champs>[http://www.gbrathletics.com/nc/jpn.htm Japanese Championships]. GBR Athletics. Retrieved on 2009-09-23.</ref><ref name=Games>[http://www.gbrathletics.com/nc/jpng.htm Japanese National Games]. GBR Athletics. Retrieved on 2009-09-23.</ref><ref>[http://www.gbrathletics.com/ic/asi.htm Asian Indoor Championships]. GBR Athletics. Retrieved on 2009-09-23.</ref> Also, she competed at her first [World Junior Championships](/source/2004_World_Junior_Championships_in_Athletics), reaching the final and finishing in sixth place.<ref>[http://www.iaaf.org/history/WJC/season=2004/eventCode=3229/results/bydiscipline/disctype=4/sex=W/discCode=400/combCode=hash/roundCode=f/results.html#det 2004 World Junior Championships 400 Metres – W   Final]  {{webarchive|url=https://web.archive.org/web/20090315072312/http://www.iaaf.org/history/WJC/season%3D2004/eventCode%3D3229/results/bydiscipline/disctype%3D4/sex%3DW/discCode%3D400/combCode%3Dhash/roundCode%3Df/results.html#det |date=March 15, 2009 }}. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref>

The following year she broke the 400&nbsp;m indoor record with 53.64&nbsp;seconds in [Tianjin](/source/Tianjin) and won the [800 metres](/source/800_metres) at the National Games.<ref name=Games /><ref name=IAAFBio>[http://www.iaaf.org/athletes/biographies/letter=0/athcode=200251/index.html Biography Tanno, Asami]. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref> At the national championships she came second in the 200&nbsp;m to [Sakie Nobuoka](/source/Sakie_Nobuoka) and she also improved her own 400&nbsp;m Japanese outdoor record.<ref>Nakamura, Ken (2005-06-04). [http://www.iaaf.org/news/Kind=2/newsId=29624.html Highlights of JPN National Championships – Day 1 and 2]. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref> After coming close to her record in the heats, she became a two time 400&nbsp;m national champion with 51.93&nbsp;seconds, knocking a second off her previous best.<ref name=Champs /> This was sufficient for qualification in the [2005 World Championships in Athletics](/source/2005_World_Championships_in_Athletics), but Tanno did not progress beyond the [400&nbsp;m preliminary rounds](/source/2005_World_Championships_in_Athletics_%E2%80%93_Women's_400_metres).<ref>[http://www.iaaf.org/history/wch/season=2005/eventcode=3365/results/bydiscipline/disctype=4/sex=W/discCode=400/combCode=hash/roundCode=h/results.html#detW_400_hash_h 2005 World Championships 400 Metres – W   Heats]  {{webarchive|url=https://web.archive.org/web/20090803215032/http://www.iaaf.org/history/wch/season%3D2005/eventcode%3D3365/results/bydiscipline/disctype%3D4/sex%3DW/discCode%3D400/combCode%3Dhash/roundCode%3Dh/results.html#detW_400_hash_h |date=August 3, 2009 }}. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref> She rebounded, however, at the [Asian Championships](/source/2005_Asian_Championships_in_Athletics), winning two bronze medals in the individual and relay 400&nbsp;m events.<ref>[http://www.asianathletics.org/results/ac-results.htm Asian Championships results] {{webarchive|url=https://web.archive.org/web/20091217115405/http://www.asianathletics.org/results/ac-results.htm |date=2009-12-17 }}. [Asian Athletics Association](/source/Asian_Athletics_Association). Retrieved on 2009-09-23.</ref> Her good form continued as she finished fourth at the [2005 Summer Universiade](/source/Athletics_at_the_2005_Summer_Universiade) and set a new best at the [Seiko Super Track & Field Meet](/source/Seiko_Super_Track_%26_Field_Meet) (''Super Rikujyo'').<ref>[http://www.fisu.net/medias/fichiers/711.pdf 2005 Summer Universiade Athletics results]. [FISU](/source/International_University_Sports_Federation) (2005). Retrieved on 2009-09-23.</ref> At the meeting she finished with 51.80&nbsp;seconds and although this was some distance behind American [Dee Dee Trotter](/source/Dee_Dee_Trotter) (50.03) Tanno stated that she aspired to break 51&nbsp;seconds in her career too.<ref>Nakamura, Ken (2005-09-19). [http://www.iaaf.org/news/Kind=2/newsId=32141.html Seven Helsinki champions win but Isinbayeva no heights in Yokohama]. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref> She ended the year with a 400&nbsp;m gold medal at the [2005 East Asian Games](/source/2005_East_Asian_Games).<ref>[http://www.asianathletics.org/results/eag-results.htm East Asian Games results] {{webarchive |url=https://web.archive.org/web/20090215170021/http://www.asianathletics.org/results/eag-results.htm |date=February 15, 2009 }}. [Asian Athletics Association](/source/Asian_Athletics_Association). Retrieved on 2009-09-23.</ref>

In 2006, she won the [Osaka Grand Prix](/source/Osaka_Grand_Prix) in May with a season's best of 51.84&nbsp;seconds.<ref>Nakamura, Ken (2006-05-06). [http://www.iaaf.org/history/GP/season=2006/news/kind=100/newsid=34495.html Gatlin makes 9.95 season debut in Osaka – IAAF World Athletics Tour]. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref> Tanno did not run at the national championships finals, missing out on a third consecutive win.<ref name=JAAF /> She competed in the [2006 IAAF World Cup](/source/2006_IAAF_World_Cup), forming part of the Asian women's [4×400 metres relay](/source/4%C3%97400_metres_relay) team, but ended up in last place.<ref>[http://www.iaaf.org/history/WCP/season=2006/eventCode=3490/results/bydiscipline/disctype=4/sex=W/discCode=4X4/combCode=hash/roundCode=f/results.html#det 2006 IAAF World Cup 4x400 Metres Relay – W   Final]. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref> She finished the year with an appearance at the [2006 Asian Games](/source/Athletics_at_the_2006_Asian_Games), taking the bronze medal in the 400&nbsp;m and finishing fourth in the relay.<ref name=JAAF /><ref>[http://search.japantimes.co.jp/cgi-bin/sp20061212a1.html Narisako hurdles, Sawano vaults, Ikeda leaps to gold in Doha]. ''[The Japan Times](/source/The_Japan_Times)'' (2006-12-12). Retrieved on 2009-09-23.</ref>

===2007 Osaka Championships and Beijing Olympics===
Returning to the Osaka GP, she set a national record of 3:30.53 in the 4×400&nbsp;m relay with [Mayu Kida](/source/Mayu_Sato), [Satomi Kubokura](/source/Satomi_Kubokura) and [Makiko Yoshida](/source/Makiko_Yoshida), and also took second place behind [Mary Wineberg](/source/Mary_Wineberg) in the individual race.<ref>Nakamura, Ken (2007-05-05). [http://www.iaaf.org/history/GP/season=2007/news/kind=100/newsid=38573.html Unpressed 44.02 by Wariner in Osaka – IAAF World Athletics Tour]. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref> The national championships acted as trials for the [2007 World Championships](/source/2007_World_Championships_in_Athletics) in [Osaka](/source/Osaka), and Tanno won the 400&nbsp;m and pushed Sakie Nobuoka to the line in the 200&nbsp;m, narrowly finishing second.<ref>Nakamura, Ken (2007-06-30). [http://osaka2007.iaaf.org/news/kind=2/newsid=39341.html Murofushi wins 13th straight title – Japanese Champs, Day 2]  {{webarchive|url=https://web.archive.org/web/20120827200327/http://osaka2007.iaaf.org/news/kind%3D2/newsid%3D39341.html |date=August 27, 2012 }}. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref><ref>Nakamura, Ken  (2007-07-01). [http://osaka2007.iaaf.org/news/kind=2/newsid=39348.html Fukushi completes fourth straight double, as Osaka completes it dress-rehearsal – Japanese Champs, Day 3]  {{webarchive|url=https://web.archive.org/web/20120827200545/http://osaka2007.iaaf.org/news/kind%3D2/newsid%3D39348.html |date=August 27, 2012 }}. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref> A month before the World Championships, she ran the 400&nbsp;m at the [Asian Championships](/source/2007_Asian_Championships_in_Athletics), winning the silver medal behind Indian [Chitra Soman](/source/Chitra_Soman).<ref>Mohan, K.P. (2007-07-28). [https://web.archive.org/web/20080921091018/http://www.hindu.com/2007/07/28/stories/2007072863272500.htm Chitra Soman gives India gold in 400m]. ''[The Hindu](/source/The_Hindu)''. Retrieved on 2009-09-23.</ref> She won her second silver of the competition with the Japanese 4×400&nbsp;m relay, beaten to the gold again by the Indian athletes.<ref>[http://www.asianathletics.org/AAC07/day5-results.htm 17th Asian Athletics Championships Amman 2007 Day 5 results] {{webarchive |url=https://web.archive.org/web/20110726151835/http://www.asianathletics.org/AAC07/day5-results.htm |date=July 26, 2011 }}. [Asian Athletics Association](/source/Asian_Athletics_Association) (2007-07-27). Retrieved on 2009-09-23.</ref>

Representing the host nation at the World Championships, she failed to reach the [finals of the 400&nbsp;m](/source/2007_World_Championships_in_Athletics_%E2%80%93_Women's_400_metres). However, she recorded a season's best of 51.81&nbsp;seconds and succeeded in becoming the first ever Japanese woman to reach the semi-finals of a [sprinting](/source/sprint_(running)) event at the [World Championships](/source/World_Championships_in_Athletics).<ref name=JAAF /><ref>[http://osaka2007.iaaf.org/results/gender=W/discipline=400/combCode=hash/roundCode=sf/result.html 2007 World Championships 400 Metres – W   Semi-Final]  {{webarchive|url=https://web.archive.org/web/20080418004130/http://osaka2007.iaaf.org/results/gender%3DW/discipline%3D400/combCode%3Dhash/roundCode%3Dsf/result.html |date=April 18, 2008 }}. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref> In the 4×400&nbsp;m relay the Japanese team ([Sayaka Aoki](/source/Sayaka_Aoki_(athlete)), Tanno, Kubokura and Kida) were eliminated in the heats, but they managed a new national record of 3:30.17, improving upon the mark Tanno had helped set earlier in the season.<ref>[http://osaka2007.iaaf.org/results/gender=W/discipline=4X4/combCode=hash/roundCode=h/result.html 2007 World Championships 4x400 Metres Relay – W   Heats]  {{webarchive|url=https://web.archive.org/web/20080809001354/http://osaka2007.iaaf.org/results/gender%3DW/discipline%3D4X4/combCode%3Dhash/roundCode%3Dh/result.html |date=August 9, 2008 }}. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref>

She missed the 2008 Asian Indoor Championship in Doha and began the outdoor season with another national record,<ref>[http://www.qatarathletic.com/asia-ind/PDF/Results-Thursday.pdf 3rd Asian Indoor Championship in Athletics – Day one]. Qatar Athletic. Retrieved on 2009-09-26.</ref> recording 51.75&nbsp;seconds at the [Shizuoka International](/source/Shizuoka_International) in May. She was expected to improve further at the Osaka GP, but wet conditions slowed the athletes and she finished third with 52.55&nbsp;seconds.<ref>Nakamura, Kwn (2008-05-09). [http://www.iaaf.org/news/Kind=100/newsid=44740.html World Champs Liu and Walker return to Osaka PREVIEW – IAAF World Athletics Tour]. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref><ref>Nakamura, Ken (2008-05-10). [http://www.iaaf.org/GP08/news/kind=100/newsid=44770.html Led by Liu, Chinese take the spotlight in the Osaka chill and rain – IAAF World Athletics Tour]. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref> At the national championships, which were also the trials for the [2008 Beijing Olympics](/source/2008_Beijing_Olympics), she beat hurdles specialist Kubokura to the title and was selected to represent [Japan at the Olympics](/source/Japan_at_the_2008_Summer_Olympics).<ref>Nakamura, Ken (2008-06-28). [http://www.iaaf.org/OLY08/news/kind=100/newsid=45538.html Murofushi and Shibui superb at Japanese Championships]. [IAAF](/source/IAAF). Retrieved on 2009-09-26.</ref> At the Olympics in August, she recorded 52.60&nbsp;seconds in the [qualification rounds](/source/Athletics_at_the_2008_Summer_Olympics_%E2%80%93_Women's_400_metres), which was not sufficient to progress.<ref>[http://www.iaaf.org/oly08/results/eventCode=3659/bydiscipline/disctype=4/sex=W/discCode=400/combCode=hash/roundCode=h/results.html#detW_400_hash_h 2008 Summer Olympics 400 Metres – W   Heats]  {{webarchive|url=https://web.archive.org/web/20090813120355/http://www.iaaf.org/oly08/results/eventCode%3D3659/bydiscipline/disctype%3D4/sex%3DW/discCode%3D400/combCode%3Dhash/roundCode%3Dh/results.html#detW_400_hash_h |date=August 13, 2009 }}. [IAAF](/source/IAAF) (2008-08-16). Retrieved on 2009-09-26.</ref> She returned to the track with the Japanese relay team. While their time of 3:30.52 was not far off the team's national record, it left them in eighth place at the [heats stage](/source/Athletics_at_the_2008_Summer_Olympics_%E2%80%93_Women's_4_%C3%97_400_metres_relay).<ref>[http://www.iaaf.org/oly08/results/eventCode=3659/bydiscipline/disctype=4/sex=W/discCode=4X4/combCode=hash/roundCode=h/results.html#detW_4X4_hash_h 2008 Summer Olympics 4x400 Metres Relay – W   Heats]  {{webarchive|url=https://web.archive.org/web/20090813024210/http://www.iaaf.org/oly08/results/eventCode%3D3659/bydiscipline/disctype%3D4/sex%3DW/discCode%3D4X4/combCode%3Dhash/roundCode%3Dh/results.html#detW_4X4_hash_h |date=August 13, 2009 }}. [IAAF](/source/IAAF) (2008-08-22). Retrieved on 2009-09-26.</ref>

===2009 World Championships and 2010 Asian Games===
She opened her season at the Shizuoka International, winning in a modest 53.21&nbsp;seconds.<ref>Nakamura, Ken (2009-05-06).[http://www.iaaf.org/news/kind=100/newsid=50467.html National women’s 200m record and world season 10,000m lead – Japanese competition round-up] {{webarchive|url=https://web.archive.org/web/20110629142529/http://www.iaaf.org/news/kind%3D100/newsid%3D50467.html |date=2011-06-29 }}. [IAAF](/source/IAAF). Retrieved on 2009-09-26.</ref> Tanno repeated her performance from the previous year in the Osaka GP, taking third behind foreign opposition – Australian [Tamsyn Lewis](/source/Tamsyn_Lewis) and American [Latosha Wallace](/source/Latosha_Wallace).<ref>Nakamura, Ken (2009-05-09). [http://www.iaaf.org/GP09/news/kind=100/newsid=50494.html ‘07 World champs Wariner, Clement and Thomas win again in Osaka – IAAF World Athletics Tour]. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref> At the Japanese Trials for the World Championships, she beat Aoki to the national title, her fifth victory at the championships in six years.<ref>Nakamura, Ken (2009-06-29). [http://berlin.iaaf.org/news/kind=100/newsid=51404.html Sprinters excel at the Japanese Champs] {{webarchive|url=https://web.archive.org/web/20120610180844/http://berlin.iaaf.org/news/kind%3D100/newsid%3D51404.html |date=2012-06-10 }}. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref> Tanno could not match her 2007 performance at the [2009 World Championships](/source/2009_World_Championships_in_Athletics) and she was eliminated in the [400 m heats](/source/2009_World_Championships_in_Athletics_%E2%80%93_Women's_400_metres) with a sub-par 53.30&nbsp;seconds.<ref>[http://berlin.iaaf.org/results/bydiscipline/disctype=4/sex=W/discCode=400/combCode=hash/roundCode=h/results.html#detW_400_hash_h 2009 World Championships 400 Metres – W   Heats]  {{webarchive|url=https://web.archive.org/web/20090921010954/http://berlin.iaaf.org/results/bydiscipline/disctype%3D4/sex%3DW/discCode%3D400/combCode%3Dhash/roundCode%3Dh/results.html#detW_400_hash_h |date=September 21, 2009 }}. [IAAF](/source/IAAF) (2009-08-15). Retrieved on 2009-09-26.</ref> A Japanese team of Aoki, Tanno, Sato (née Kida) and Kubokura did not perform well in the [4×400 metres relay competition](/source/2009_World_Championships_in_Athletics_%E2%80%93_Women's_4_%C3%97_400_metres_relay), finishing last in their heat with 3:34.46.<ref>[http://berlin.iaaf.org/results/bydiscipline/disctype=4/sex=W/discCode=4X4/combCode=hash/roundCode=h/results.html#detW_4X4_hash_h 2009 World Championships 4x400 Metres Relay – W   Heats]  {{webarchive|url=https://web.archive.org/web/20090827210840/http://berlin.iaaf.org/results/bydiscipline/disctype%3D4/sex%3DW/discCode%3D4X4/combCode%3Dhash/roundCode%3Dh/results.html#detW_4X4_hash_h |date=August 27, 2009 }}. [IAAF](/source/IAAF) (2009-08-22). Retrieved on 2009-09-26.</ref>

After the World Championships, she competed at the Super Meet in [Kawasaki](/source/Kawasaki%2C_Kanagawa), beating off [Barbara Petráhn](/source/Barbara_Petr%C3%A1hn) and [Maris Mägi](/source/Maris_M%C3%A4gi) to win the 400&nbsp;m.<ref>Nakamura, Ken (2009-09-23). [http://www.iaaf.org/news/kind=100/newsid=54478.html Gay and Felix take dash victories; new Japanese hero's spear falls short at Super Meet]. [IAAF](/source/IAAF). Retrieved on 2009-09-23.</ref>

She was married in February 2010. She failed to defend her national title in 2010 after suffering injuries earlier in the season, leaving [Chisato Tanaka](/source/Chisato_Tanaka) to take the victory.<ref>Nakamura, Ken (2010-06-07). [http://www.iaaf.org/news/kind=100/newsid=56971.html Murofushi and Murakami extended their winning streak at the Japanese National Championships]. [IAAF](/source/IAAF). Retrieved on 2010-06-07.</ref> She represented Asia at the [2010 IAAF Continental Cup](/source/2010_IAAF_Continental_Cup), but finished last in the 400&nbsp;m.<ref>[http://www.iaaf.org/wcp10/results/eventcode=4435/racedate=09-04-2010/sex=W/discCode=400/combCode=hash/roundCode=f/results.html#detW_400_hash_f 2010 Continental Cup 400 Metres – W   Final]  {{webarchive|url=https://web.archive.org/web/20101208051848/http://www.iaaf.org/wcp10/results/eventcode%3D4435/racedate%3D09-04-2010/sex%3DW/discCode%3D400/combCode%3Dhash/roundCode%3Df/results.html#detW_400_hash_f |date=December 8, 2010 }}. [IAAF](/source/IAAF). Retrieved on 2010-11-28.</ref> She won the silver medal at the [2010 Asian Games](/source/Athletics_at_the_2010_Asian_Games), although the Japanese team missed out on a relay medal as they finished in fourth.<ref>[http://www.iaaf.org/news/kind=100/newsid=58792.html Three more gold for China, as Kamel bows out of 1500m in Guangzhou – Asian Games, Day 2]. [IAAF](/source/IAAF) (2010-11-23). Retrieved on 2010-11-28.</ref>

==Personal bests==
{| class=wikitable
|-
! Event
! Time ([sec](/source/second))
! Venue
! Date
|-
| [200 metres](/source/200_metres) || 23.75 || [Yokohama](/source/Yokohama), Japan || 10 June 2006
|-
| [300 metres](/source/300_metres) || 38.53 || [Tokyo](/source/Tokyo), Japan || 2 September 2006
|-
| [400 metres](/source/400_metres) || 51.75 [NR](/source/List_of_Japanese_records_in_athletics) || [Fukuroi](/source/Fukuroi), Japan || 3 May 2008
|-
| [400 metres](/source/400_metres) (indoor) || 53.64 [NR](/source/List_of_Japanese_records_in_athletics) || [Tianjin](/source/Tianjin), [PR China](/source/People's_Republic_of_China) || 1 March 2005
|}
* <small>All information taken from IAAF profile.</small>

==Competition record==
{| {{AchievementTable|width=auto|Event=yes}}
|-
! colspan="6" | Representing {{JPN}}
|-
| rowspan=2 | 2002
| rowspan=2 | [Asian Junior Championships](/source/2002_Asian_Junior_Athletics_Championships)
| rowspan=2 | [Bangkok](/source/Bangkok), Thailand
| bgcolor="silver" | 2nd
| 400 m
| 54.72
|-
| bgcolor="cc9966" | 3rd
| 4×100 m relay
| 3:44.48
|-
| rowspan=5 | 2004
| rowspan=2 | [Asian Junior Championships](/source/2004_Asian_Junior_Athletics_Championships)
| rowspan=2 | [Ipoh](/source/Ipoh), Malaysia
| bgcolor="silver" | 2nd
| 400 m
| 52.88
|-
| bgcolor="gold" | 1st
| 4×100 m relay
| 46.01
|-
| [Asian Indoor Championships](/source/2004_Asian_Indoor_Athletics_Championships)
| [Tehran](/source/Tehran), Iran
| bgcolor="cc9966" | 3rd
| 200 m
| 24.99
|-
| rowspan=2 | [World Junior Championships](/source/2004_World_Junior_Championships_in_Athletics)
| rowspan=2 | [Grosseto](/source/Grosseto), Italy
| 6th
| 400m
| [53.34](/source/2004_World_Junior_Championships_in_Athletics_%E2%80%93_Women's_400_metres)
|-
| 13th (h)
| 4×100m relay
| [45.80](/source/2004_World_Junior_Championships_in_Athletics_%E2%80%93_Women's_4_%C3%97_100_metres_relay)
|-
| rowspan=6 | 2005
| [World Championships](/source/2005_World_Championships_in_Athletics)
| [Helsinki](/source/Helsinki), Finland
| 30th (h)
| 400 m
| [52.80](/source/2005_World_Championships_in_Athletics_%E2%80%93_Women's_400_metres)
|-
| [Universiade](/source/Athletics_at_the_2005_Summer_Universiade)
| [İzmir](/source/%C4%B0zmir), Turkey
| 4th
| 400 m
| [52.91](/source/Athletics_at_the_2005_Summer_Universiade_%E2%80%93_Women's_400_metres)
|-
| rowspan=2 | [Asian Championships](/source/2005_Asian_Championships_in_Athletics)
| rowspan=2 | [Incheon](/source/Incheon), South Korea
| bgcolor="gold" | 1st
| 400 m
| [52.69](/source/2005_Asian_Athletics_Championships_%E2%80%93_Women's_400_metres)
|-
| bgcolor="silver" | 2nd
| 4×400 m relay
| [3:36.64](/source/2005_Asian_Athletics_Championships_%E2%80%93_Women's_4_%C3%97_400_metres_relay)
|-
| rowspan=2 | [East Asian Games](/source/2005_East_Asian_Games)
| rowspan=2 | [Macau](/source/Macau)
| bgcolor="cc9966" | 3rd
| 400m
| 52.91
|-
| bgcolor="cc9966" | 3rd
| 4x400m relay
| 3:33.54
|-
| rowspan=3 | 2006
| [World Cup](/source/2006_IAAF_World_Cup)
| [Athens](/source/Athens), Greece
| 9th
| 4×400 m relay
| [3:38.85](/source/2006_IAAF_World_Cup_results)<ref>representing Asia</ref>
|-
| rowspan=2 | [Asian Games](/source/Athletics_at_the_2006_Asian_Games)
| rowspan=2 | [Doha](/source/Doha), Qatar
| bgcolor="cc9966" | 3rd
| 400 m
| [53.04](/source/Athletics_at_the_2006_Asian_Games_%E2%80%93_Women's_400_metres)
|-
| 4th
| 4×400 m relay
| [3:35.08](/source/Athletics_at_the_2006_Asian_Games_%E2%80%93_Women's_4_%C3%97_400_metres_relay)
|-
| rowspan=4 | 2007
| rowspan=2 | [Asian Championships](/source/2007_Asian_Championships_in_Athletics)
| rowspan=2 | [Amman](/source/Amman), Jordan
| bgcolor="silver" | 2nd
| 400 m
| [53.20](/source/2007_Asian_Athletics_Championships_%E2%80%93_Women's_400_metres)
|-
| bgcolor="silver" | 2nd
| 4×400 m relay
| [3:33.82](/source/2007_Asian_Athletics_Championships_%E2%80%93_Women's_4_x_400_metres_relay)
|-
| rowspan=2 | [World Championships](/source/2007_World_Championships_in_Athletics)
| rowspan=2 | [Osaka](/source/Osaka), Japan
| 20th (sf)
| 400 m
| [51.81](/source/2007_World_Championships_in_Athletics_%E2%80%93_Women's_400_metres)
|-
| 11th (h)
| 4×400 m relay
| [3:30.17](/source/2007_World_Championships_in_Athletics_%E2%80%93_Women's_4_%C3%97_400_metres_relay) (NR)
|-
| rowspan=2 | 2008
| rowspan=2 | [Olympic Games](/source/Athletics_at_the_2008_Summer_Olympics)
| rowspan=2 | [Beijing](/source/Beijing), China
| 28th (h)
| 400 m
| [52.60](/source/Athletics_at_the_2008_Summer_Olympics_%E2%80%93_Women's_400_metres)
|-
| 15th (h)
| 4×400 m relay
| [3:30.52](/source/Athletics_at_the_2008_Summer_Olympics_%E2%80%93_Women's_4_%C3%97_400_metres_relay)
|-
| rowspan=4 | 2009
| rowspan=2 | [World Championships](/source/2009_World_Championships_in_Athletics)
| rowspan=2 | [Berlin](/source/Berlin), Germany
| 27th (h)
| 400 m
| [53.30](/source/2009_World_Championships_in_Athletics_%E2%80%93_Women's_400_metres)
|-
| 14th (h)
| 4×400 m relay
| [3:34.46](/source/2009_World_Championships_in_Athletics_%E2%80%93_Women's_4_%C3%97_400_metres_relay)
|-
| rowspan=2 | [Asian Championships](/source/2009_Asian_Athletics_Championships)
| rowspan=2 | [Guangzhou](/source/Guangzhou), China
| bgcolor=gold | 1st
| 400 m
| [53.32](/source/2009_Asian_Athletics_Championships_%E2%80%93_Women's_400_metres)
|-
| bgcolor=cc9966 | 3rd
| 4×400 m relay
| [3:31.95](/source/2009_Asian_Athletics_Championships_%E2%80%93_Women's_4_%C3%97_400_metres_relay)
|-
| rowspan=3 | 2010
| [Continental Cup](/source/2010_IAAF_Continental_Cup)
| [Split](/source/Split%2C_Croatia), Croatia
| 8th
| 400 m
| [53.38](/source/2010_IAAF_Continental_Cup_results)<ref>representing Asia-Pacific</ref>
|-
| rowspan=2 | [Asian Games](/source/Athletics_at_the_2010_Asian_Games)
| rowspan=2 | [Guangzhou](/source/Guangzhou), China
| bgcolor=silver | 2nd
| 400 m
| [52.68](/source/Athletics_at_the_2010_Asian_Games_%E2%80%93_Women's_400_metres)
|-
| 4th
| 4×400 m relay
| [3:31.81](/source/Athletics_at_the_2010_Asian_Games_%E2%80%93_Women's_4_%C3%97_400_metres_relay)
|-
| 2013
| [Asian Championships](/source/2013_Asian_Athletics_Championships)
| [Pune](/source/Pune), India
| bgcolor=cc9966 | 3rd
| 4×400 m relay
| [3:35.72](/source/2013_Asian_Athletics_Championships_%E2%80%93_Women's_4_%C3%97_400_metres_relay)
|-
| 2014
| [Asian Games](/source/Athletics_at_the_2014_Asian_Games)
| [Incheon](/source/Incheon), South Korea
| bgcolor=silver | 2nd
| 4×400 m relay
| [3:30.80](/source/Athletics_at_the_2014_Asian_Games_%E2%80%93_Women's_4_%C3%97_400_metres_relay)
|-
| rowspan=3 | 2015
| rowspan=2 | [Asian Championships](/source/2015_Asian_Athletics_Championships)
| rowspan=2 | [Wuhan](/source/Wuhan), China
| 7th
| 400 m
| [54.71](/source/2015_Asian_Athletics_Championships_%E2%80%93_Women's_400_metres)
|-
| 4th
| 4×400 m relay
| [3:35.93](/source/2015_Asian_Athletics_Championships_%E2%80%93_Women's_4_%C3%97_400_metres_relay)
|-
| [World Championships](/source/2015_World_Championships_in_Athletics)
| [Beijing](/source/Beijing), China
| 13th (h)
| 4×400 m relay
| [3:28.91](/source/2015_World_Championships_in_Athletics_%E2%80%93_Women's_4_%C3%97_400_metres_relay)
|}

* Japanese national 400&nbsp;m champion: 2004, 2005, 2007, 2008, 2009

==References==
{{reflist}}

==External links==
*{{sports links}}

{{Footer Asian Champions women's 400 metres}}
{{Japan Championships in Athletics women's 400 metres champions}}
{{Authority control}}

{{DEFAULTSORT:Chiba, Asami}}
Category:1985 births
Category:Living people
Category:Japanese women sprinters
Category:Athletes from Fukushima Prefecture
Category:Athletes (track and field) at the 2008 Summer Olympics
Category:Olympic athletes for Japan
Category:Athletes (track and field) at the 2006 Asian Games
Category:Athletes (track and field) at the 2010 Asian Games
Category:Athletes (track and field) at the 2014 Asian Games
Category:World Athletics Championships athletes for Japan
Category:Asian Athletics Championships winners
Category:Asian Athletics Championships medalists
Category:Asian Games silver medalists for Japan
Category:Asian Games bronze medalists for Japan
Category:Medalists at the 2006 Asian Games
Category:Medalists at the 2010 Asian Games
Category:Medalists at the 2014 Asian Games
Category:21st-century Japanese sportswomen
Category:Asian Games silver medalists in athletics (track and field)
Category:Asian Games bronze medalists in athletics (track and field)
Category:Medalists at the 2005 East Asian Games

---
Adapted from the Wikipedia article [Asami Chiba](https://en.wikipedia.org/wiki/Asami_Chiba) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Asami_Chiba?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.
