Koki Niwa
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Koki Niwa (丹羽 孝希, Niwa Kōki, born 10 October 1994) is a Japanese male table tennis player. He is the gold medalist at the 2010 Youth Olympic Games and he won the World Junior Table Tennis Championships in 2010 (doubles) and 2011 (singles).

On 21 April 2012, he defeated Ma Long of China, World Rank no 1, to become the first player to be qualified for 2012 Olympics from the Asian Olympic Qualifiers.

Since 2012 he is playing for the German Team TTC matec Frickenhausen.

He won the 2014 Russian Open singles title.

Niwa had a prolific junior career beginning in 2008. He reached the quarter-finals at the 2008 India Junior Open in Pune, India, and won the doubles title with his partner Yuki Hirano. At the 2008 World Junior Championships in Madrid, Spain, he parterned with Kenta Matsudaira to reach the semi-finals. The following year, Niwa partnered with Asuka Machi to win the 2009 ITTF Cadet Challenge and ITTF Junior Circuit Finals in Tokyo, Japan.