Japan - T League 03/02 06:30 - Koki Niwa v Taimu Arinobu L 1-3
Japan - T League 12/09 06:00 - Koki Niwa v Taimu Arinobu W 3-2
Japan - T League 11/17 11:00 - Kakeru Sone v Koki Niwa W 2-3
Japan - T League 02/18 04:30 - Satoshi Aida v Koki Niwa L 3-0
Japan - T League 02/05 05:40 - Koki Niwa v Hiroto Shinozuka L 0-3
Japan - T League 02/04 05:15 - Koki Niwa v Kakeru Sone W 3-2
Japan - T League 01/09 04:50 - Koki Niwa v Matsushima Teruzora L 1-3
WTT - Contender Almaty 09/16 11:30 4 Koki Niwa v Yuanyu Chen L 1-3
WTT - Contender Almaty 09/15 13:45 - Koki Niwa v Cheng-Ting Liao W 3-1
WTT Contender Muscat 09/07 15:30 - Benedikt Duda v Koki Niwa L 3-2
WTT - Contender - Tunis 08/04 15:00 - Gaoyuan Lin v Koki Niwa L 3-0
WTT - Contender - Tunis 08/03 15:30 - Koki Niwa v Jaehyun An W 3-1
WTT Contender - Tunis - Kwal. 08/02 18:30 - Wen Sun v Koki Niwa W 1-3
WTT Contender - Tunis - Kwal. 08/02 14:00 - Yuta Tanaka v Koki Niwa W 1-3
WTT Star Contender Budapest Quals 07/11 10:40 - Cheng-Ting Liao v Koki Niwa L 3-2
WTT - Contender Lima 06/18 19:05 - Koki Niwa v Anton Kallberg L 2-3
WTT - Contender Lima 06/17 23:05 - Horacio Cifuentes v Koki Niwa W 1-3
WTT - Contender Lima 06/17 00:15 5 Koki Niwa v Brian Afanador W 3-1
Japan - T League 03/03 10:25 - Yuya Oshima v Koki Niwa W 0-1
Japan - T League 02/22 10:00 - Koki Niwa v Kazuki Hamada W 3-1
Japan - T League 02/19 03:01 - Yuya Oshima v Koki Niwa L 3-0
Japan - T League 02/13 04:46 - Teru Matsushima v Koki Niwa W 1-3
Japan - T League 02/11 06:11 - Koki Niwa v Teru Matsushima W 3-0
Japan - T League 02/10 11:18 - Koki Niwa v Maharu Yoshimura L 1-3
Japan - T League 12/26 10:00 - Koki Niwa v Masataka Morizono W 3-1
World Championship 11/24 21:20 57 Koki Niwa v Daniel Habesohn L 2-4
World Championship 11/24 02:00 57 Koki Niwa v Nandor Ecseki W 4-0
Japan - T League 10/24 09:00 - Tomokazu Harimoto v Koki Niwa L 3-0
Japan - T League 10/23 06:00 - Tomokazu Harimoto v Koki Niwa L 3-0
Japan - T League 09/22 10:00 - Koki Niwa v Mizuki Oikawa L 2-3

Wikipedia - Koki Niwa

Koki Niwa (Tomakomai, Hokkaido, 10 oktober 1994) is een Japanse professioneel tafeltennisser. Hij speelt linkshandig met de shakehandgreep.

In 2012 (Londen), 2016 (Rio de Janeiro) en 2020 (Tokio) nam hij deel aan de Olympische spelen.