ITF M15 Tsukuba 03/27 00:50 25 Yi Zhou v Kazuki Nishiwaki 4-6,6-4,6-3
ITF M15 Nishi-Tokyo 03/20 06:30 25 Leo Vithoontien v Kazuki Nishiwaki 6-2,6-3
ITF M15 Torello 03/07 11:40 26 Kazuki Nishiwaki v Ergi Kirkin 1-6,1-6
ITF M15 Torello 03/06 12:40 25 Kazuki Nishiwaki v Manel L Juncadella 6-4,6-2
ITF M15 Villena 02/27 12:00 25 Fausto Tabacco v Kazuki Nishiwaki 6-3,6-1
ITF M15 Yanagawa 12/26 03:25 25 Kazuki Nishiwaki v Jumpei Yamasaki 3-6,3-6
ITF M15 Yanagawa 12/20 04:30 25 Kazuki Nishiwaki v Takuya Kumasaka Retired
Challenger de Yokkaichi 11/26 04:20 14 Calum Puttergill v Kazuki Nishiwaki 7-5,6-2
Challenger de Matsuyama 11/05 04:55 14 Kazuki Nishiwaki v Rio Noguchi 2-6,5-7
ITF M25 Dharwad 10/20 04:30 27 Kazuki Nishiwaki v Digvijay Pratap Singh 4-6,7-6,2-6
ITF M25 Dharwad 10/19 04:35 26 Kazuki Nishiwaki v Madhwin Kamath 6-4,6-4
ITF M25 Dharwad 10/18 09:25 25 Kazuki Nishiwaki v Ryotaro Matsumura 6-2,7-5
ITF M25 Takasaki 09/22 01:00 27 Kazuki Nishiwaki v Collin Altamirano 3-6,1-6
ITF M25 Takasaki 09/21 01:50 26 Kazuki Nishiwaki v Leo Vithoontien 5-7,6-4,6-4
ITF M25 Takasaki 09/20 02:40 25 Kazuki Nishiwaki v Taisei Miyamoto 6-3,6-0
ITF M25 Sapporo 09/17 01:55 29 Naoki Nakagawa v Kazuki Nishiwaki 4-6,6-1,6-4
ITF M25 Sapporo 09/16 05:30 28 Shuichi Sekiguchi v Kazuki Nishiwaki 6-0,5-7,4-6
ITF M25 Sapporo 09/16 01:00 27 Kazuki Nishiwaki v Yuki Mochizuki 6-1,6-3
ITF M25 Sapporo 09/15 03:20 26 Kosuke Ogura v Kazuki Nishiwaki 4-6,7-5,2-6
ITF M25 Sapporo 09/13 04:00 25 Kazuki Nishiwaki v Taki Adachi 6-1,6-2
ITF M25 Hong Kong 09/09 10:00 27 Kazuki Nishiwaki v Coleman Wong 2-6,7-5,8-10
ITF M25 Hong Kong 09/07 07:00 26 Jie Cui v Kazuki Nishiwaki 5-7,4-6
ITF M25 Hong Kong 09/06 02:00 25 Collin Altamirano v Kazuki Nishiwaki 3-6,5-7
ITF M25 Tainan 08/26 02:00 28 Kazuki Nishiwaki v Rishab Agarwal 5-7,3-6
ITF M25 Tainan 08/25 02:00 27 Kazuki Nishiwaki v Yamato Sueoka 6-2,6-3
ITF M25 Tainan 08/24 05:20 26 Henrik Wiersholm v Kazuki Nishiwaki 3-6,6-3,1-6
ITF M25 Tainan 08/22 04:15 25 Tzu Li Chang v Kazuki Nishiwaki 1-6,3-6
ITF M25 Tainan 08/19 02:00 28 Makoto Ochi v Kazuki Nishiwaki 6-2,7-6
ITF M25 Tainan 08/18 02:00 27 Taisei Ichikawa v Kazuki Nishiwaki Retired
ITF M25 Tainan 08/17 02:00 26 Ching-Mou Yu v Kazuki Nishiwaki 5-7,3-6