Born: 10/10/1994
Height: 162 cm
Nationality: Japanese 
Style: Left-handed, Shakehand
Best WR: 5 (November 2017)
Koki Niwa (Japanese: 丹羽 孝希) was born 10 October, 1994 in Tomakomai, Japan.
In 2016 Olympics in Rio de Janeiro, Niwa won a silver medal in team event. He is a 4-time Japanese champion – 3 times in doubles & once in the singles event. On the professional circuit, Japanese international has won one title in singles and four titles in doubles event. On the club level, Niwa has won the Japanese T-League in 2020.
OLYMPIC GAMES
2016 
Rio de Janeiro 
(Team)
2020 Tokyo 
(Team)
WORLD CHAMPIONSHIPS
2012 
Dortmund (Team)
2014 Tokyo (Team)
2015 
Suzhou (Doubles)
2016 
Kuala Lumpur (Team)
2017 Düsseldorf (Doubles)
WORLD CUP
2018 
London (Team)
ASIAN CHAMPIONSHIPS
2009 
Lucknow (Team) (Doubles)
2011 
Macau (Team)
2013 
Busan (Team & Mixed Doubles) (Doubles)
2015 
Pattaya (Team) (Doubles)
2017 Wuxi (Singles & Doubles)
PROFESSIONAL TOUR SINGLES ACCOLADES
2011 Japan Open
2013 China Open
2014 
Czech Open 
Russia Open 
2015 Korea Open
2017 India Open
2018 Korea Open
PROFESSIONAL TOUR DOUBLES ACCOLADES
2010 Japan Open 
Hungarian Open
2011 
Spanish Open Korea Open Japan Open
2012 Japan Open 
Polish Open
2013 Japan Open China Open
2014 China Open Czech Open Russia Open
2015 German Open Spanish Open
2016 
Qatar Open Polish Open China Open
2017 Japan Open 
Austrian Open
NATIONAL CHAMPIONSHIPS
2010 Tokyo (Doubles)
2012 Tokyo (Singles & Doubles)
2015 Tokyo (Singles)
2016 Tokyo (Doubles)
2022 Tokyo (Singles)
CLUB CHAMPIONSHIPS
2014 Germany 1st (TTC Frickenhausen)
2020 Japan 1st (Kinoshita Meister Tokyo)
2021 Japan 1st (Okayama Rivets)
2022 Japan 1st (TT Saitama)
2023 Japan 1st (Okayama Rivets)
Table Tennis Media 