{{Short description|Japanese sprinter (born 1985)}} {{About|the sprinter formerly known as "Asami Tanno"|the voice actress|Asami Tano}} {{MedalTableTop | sport = Women's athletics | country_code = JPN | medals = {{Medal|Competition | Asian Championships }} {{Medal|Gold | 2009 Guangzhou | 400 m }} {{Medal|Silver | 2007 Amman | 400 m }} {{Medal|Silver | 2007 Amman | 4 × 400 m relay }} {{Medal|Bronze | 2005 Incheon | 400 m }} {{Medal|Bronze | 2005 Incheon | 4 × 400 m relay }} {{Medal|Bronze | 2009 Guangzhou | 4 × 400 m relay }} {{Medal|Competition | Asian Indoor Championships }} {{Medal|Bronze | 2004 Tehran | 200 m }} {{Medal|Competition | Asian Games }} {{Medal|Bronze | 2006 Doha | 400 m }} {{Medal|Competition | East Asian Games }} {{Medal|Gold | 2005 Macau | 400 m }} }}
{{Nihongo|'''Asami Chiba'''|千葉 麻美|Chiba Asami|born 25 September 1985}}, or '''Tanno''', is a Japanese sprinter who specialises in the 400 metres. She is the Japanese record holder in the event, and has also broken the national record in the 4×400 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, setting a national record in 2004, and she also reached the final of the World Junior Championships. She competed at her first World Championships the following year and won two bronze medals at the Asian Championships. In the 2006 and 2007 seasons, she won bronze at the 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. She was less successful at the 2008 Beijing Olympics and 2009 World Championships as she was eliminated in the heats at both events.
A five-time national champion in the 400 m, she has only lost once in the event at the Japanese championships, to Satomi Kubokura. She mainly competes on the Japanese athletics circuit, running at the Osaka Grand Prix, Shizuoka International and the Super Meet in Kawasaki.
==Career==
===National champion and records=== A native of Yabuki, 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, taking the 400 m silver behind Sathi Geetha and a bronze with the Japanese relay team.<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. 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. Retrieved on 2009-09-23.</ref> she came to prominence at the 2004 Asian Junior Athletics Championships in Ipoh. She set a Japanese record in the 400 m with 52.88 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. 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. Retrieved on 2009-09-23.</ref> She also ran in the 4×100 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. Retrieved on 2009-09-23.</ref>
Further success came at scholastic level, as she set championship records to win the 200 m and 400 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. Retrieved on 2010-08-08.</ref> She won a bronze medal in the 200 metres at the Asian Indoor Athletics Championships and won the 400 m events at both the 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, 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. Retrieved on 2009-09-23.</ref>
The following year she broke the 400 m indoor record with 53.64 seconds in Tianjin and won the 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. Retrieved on 2009-09-23.</ref> At the national championships she came second in the 200 m to Sakie Nobuoka and she also improved her own 400 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. Retrieved on 2009-09-23.</ref> After coming close to her record in the heats, she became a two time 400 m national champion with 51.93 seconds, knocking a second off her previous best.<ref name=Champs /> This was sufficient for qualification in the 2005 World Championships in Athletics, but Tanno did not progress beyond the 400 m preliminary rounds.<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. Retrieved on 2009-09-23.</ref> She rebounded, however, at the Asian Championships, winning two bronze medals in the individual and relay 400 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. Retrieved on 2009-09-23.</ref> Her good form continued as she finished fourth at the 2005 Summer Universiade and set a new best at the Seiko Super Track & Field Meet (''Super Rikujyo'').<ref>[http://www.fisu.net/medias/fichiers/711.pdf 2005 Summer Universiade Athletics results]. FISU (2005). Retrieved on 2009-09-23.</ref> At the meeting she finished with 51.80 seconds and although this was some distance behind American Dee Dee Trotter (50.03) Tanno stated that she aspired to break 51 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. Retrieved on 2009-09-23.</ref> She ended the year with a 400 m gold medal at the 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. Retrieved on 2009-09-23.</ref>
In 2006, she won the Osaka Grand Prix in May with a season's best of 51.84 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. 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, forming part of the Asian women's 4×400 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. Retrieved on 2009-09-23.</ref> She finished the year with an appearance at the 2006 Asian Games, taking the bronze medal in the 400 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'' (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 m relay with Mayu Kida, Satomi Kubokura and Makiko Yoshida, and also took second place behind 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. Retrieved on 2009-09-23.</ref> The national championships acted as trials for the 2007 World Championships in Osaka, and Tanno won the 400 m and pushed Sakie Nobuoka to the line in the 200 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. 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. Retrieved on 2009-09-23.</ref> A month before the World Championships, she ran the 400 m at the Asian Championships, winning the silver medal behind Indian 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''. Retrieved on 2009-09-23.</ref> She won her second silver of the competition with the Japanese 4×400 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 (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 m. However, she recorded a season's best of 51.81 seconds and succeeded in becoming the first ever Japanese woman to reach the semi-finals of a sprinting event at the World Championships.<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. Retrieved on 2009-09-23.</ref> In the 4×400 m relay the Japanese team (Sayaka Aoki, 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. 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 seconds at the 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 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. 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. Retrieved on 2009-09-23.</ref> At the national championships, which were also the trials for the 2008 Beijing Olympics, she beat hurdles specialist Kubokura to the title and was selected to represent Japan at the 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. Retrieved on 2009-09-26.</ref> At the Olympics in August, she recorded 52.60 seconds in the qualification rounds, 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 (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.<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 (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 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. 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 and American 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. 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. Retrieved on 2009-09-23.</ref> Tanno could not match her 2007 performance at the 2009 World Championships and she was eliminated in the 400 m heats with a sub-par 53.30 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 (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, 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 (2009-08-22). Retrieved on 2009-09-26.</ref>
After the World Championships, she competed at the Super Meet in Kawasaki, beating off Barbara Petráhn and Maris Mägi to win the 400 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. 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 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. Retrieved on 2010-06-07.</ref> She represented Asia at the 2010 IAAF Continental Cup, but finished last in the 400 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. Retrieved on 2010-11-28.</ref> She won the silver medal 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 (2010-11-23). Retrieved on 2010-11-28.</ref>
==Personal bests== {| class=wikitable |- ! Event ! Time (sec) ! Venue ! Date |- | 200 metres || 23.75 || Yokohama, Japan || 10 June 2006 |- | 300 metres || 38.53 || Tokyo, Japan || 2 September 2006 |- | 400 metres || 51.75 NR || Fukuroi, Japan || 3 May 2008 |- | 400 metres (indoor) || 53.64 NR || Tianjin, PR 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 | rowspan=2 | 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 | rowspan=2 | Ipoh, Malaysia | bgcolor="silver" | 2nd | 400 m | 52.88 |- | bgcolor="gold" | 1st | 4×100 m relay | 46.01 |- | Asian Indoor Championships | Tehran, Iran | bgcolor="cc9966" | 3rd | 200 m | 24.99 |- | rowspan=2 | World Junior Championships | rowspan=2 | Grosseto, Italy | 6th | 400m | 53.34 |- | 13th (h) | 4×100m relay | 45.80 |- | rowspan=6 | 2005 | World Championships | Helsinki, Finland | 30th (h) | 400 m | 52.80 |- | Universiade | İzmir, Turkey | 4th | 400 m | 52.91 |- | rowspan=2 | Asian Championships | rowspan=2 | Incheon, South Korea | bgcolor="gold" | 1st | 400 m | 52.69 |- | bgcolor="silver" | 2nd | 4×400 m relay | 3:36.64 |- | rowspan=2 | East Asian Games | rowspan=2 | Macau | bgcolor="cc9966" | 3rd | 400m | 52.91 |- | bgcolor="cc9966" | 3rd | 4x400m relay | 3:33.54 |- | rowspan=3 | 2006 | World Cup | Athens, Greece | 9th | 4×400 m relay | 3:38.85<ref>representing Asia</ref> |- | rowspan=2 | Asian Games | rowspan=2 | Doha, Qatar | bgcolor="cc9966" | 3rd | 400 m | 53.04 |- | 4th | 4×400 m relay | 3:35.08 |- | rowspan=4 | 2007 | rowspan=2 | Asian Championships | rowspan=2 | Amman, Jordan | bgcolor="silver" | 2nd | 400 m | 53.20 |- | bgcolor="silver" | 2nd | 4×400 m relay | 3:33.82 |- | rowspan=2 | World Championships | rowspan=2 | Osaka, Japan | 20th (sf) | 400 m | 51.81 |- | 11th (h) | 4×400 m relay | 3:30.17 (NR) |- | rowspan=2 | 2008 | rowspan=2 | Olympic Games | rowspan=2 | Beijing, China | 28th (h) | 400 m | 52.60 |- | 15th (h) | 4×400 m relay | 3:30.52 |- | rowspan=4 | 2009 | rowspan=2 | World Championships | rowspan=2 | Berlin, Germany | 27th (h) | 400 m | 53.30 |- | 14th (h) | 4×400 m relay | 3:34.46 |- | rowspan=2 | Asian Championships | rowspan=2 | Guangzhou, China | bgcolor=gold | 1st | 400 m | 53.32 |- | bgcolor=cc9966 | 3rd | 4×400 m relay | 3:31.95 |- | rowspan=3 | 2010 | Continental Cup | Split, Croatia | 8th | 400 m | 53.38<ref>representing Asia-Pacific</ref> |- | rowspan=2 | Asian Games | rowspan=2 | Guangzhou, China | bgcolor=silver | 2nd | 400 m | 52.68 |- | 4th | 4×400 m relay | 3:31.81 |- | 2013 | Asian Championships | Pune, India | bgcolor=cc9966 | 3rd | 4×400 m relay | 3:35.72 |- | 2014 | Asian Games | Incheon, South Korea | bgcolor=silver | 2nd | 4×400 m relay | 3:30.80 |- | rowspan=3 | 2015 | rowspan=2 | Asian Championships | rowspan=2 | Wuhan, China | 7th | 400 m | 54.71 |- | 4th | 4×400 m relay | 3:35.93 |- | World Championships | Beijing, China | 13th (h) | 4×400 m relay | 3:28.91 |}
* Japanese national 400 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