Kōko Tsurumi (鶴見虹子, Tsurumi Kōko, born September 28, 1992) is a retired Japaneseartistic gymnast. She is the 2009 World all-around bronze medalist, uneven bars silver medalist, and a two-time Olympian (2008, 2012).
Tsurumi competed at the 2009 American Cup and placed 7th all-around.
At the 2009 World Championships in London, Koko Tsurumi competed a historic performance to win the individual all-around bronze medal. During event finals, Tsurumi won the silver medal on uneven bars and placed 6th on balance beam. Tsurumi is the first Japanese woman gymnast to win a World Championships medal in 43 years.
Koko competed at the 2010 Japan Cup and placed second all-around behind Ksenia Afanasyeva. At that competition, Tsurumi scored a 15.400 on uneven bars. She debuted a new bars routine with an ono turn to half turn connected to a Tkachev and an ono turn connected to a Jaegar.
At the 2010 World Artistic Gymnastics Championships, Tsurumi experienced problems with consistency and failed to make any event finals and placed 21st in the All Around, behind countrywoman Rie Tanaka.
At the 2011 Japan Cup, Koko placed 2nd place with the Japanese team in the team competition and won the gold medal in the all around competition. She placed 0.100 higher than 2nd-place finisher, Chinese gymnast Sui Lu. Later that year she placed seventh on Uneven Bars at the World Championships and seventh with the team.
In 2012, Koko was part of Japan's Olympic team in London, where she placed seventh in the bars final and eighth with the team.
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