| Thailand Open | 05/25 07:10 | - | Yuta Tanaka v Mizuki Oikawa | L | 4-3 | |
| République tchèque - Extraleague | 03/22 17:25 | - | Mizuki Oikawa v Frane Kojic | L | 1-4 | |
| Qatar Open 2019, MS | 08/24 14:00 | 4 | Zheng, Peifeng v Mizuki Oikawa | L | 4-3 | |
| Qatar Open 2019, MS | 08/23 14:00 | 5 | Mizuki Oikawa v Koki Niwa | W | 4-1 | |
| Qatar Open XD | 08/21 13:00 | 1 | Mizuki Oikawa v Lupulesku, Lorencio | W | 4-0 | |
| République tchèque - Extraleague | 07/18 06:25 | 1 | Sambe, Kohei v Mizuki Oikawa | L | 3-0 | |
| Qatar Open XD | 07/18 02:55 | 1 | Mizuki Oikawa v Fei Xue | W | 4-2 | |
| République tchèque - Extraleague | 07/18 00:00 | 1 | Yukiya Uda v Mizuki Oikawa | W | 1-3 | |
| République tchèque - Extraleague | 07/17 05:10 | 1 | Lai, Chi-Chien v Mizuki Oikawa | W | 0-3 | |
| Qatar Open XD | 06/07 07:50 | 1 | Mizuki Oikawa v Hwang, Minha | L | 3-4 | |
| Qatar Open XD | 06/06 07:30 | 1 | Mizuki Oikawa v Chin, Mao Cheng | W | 4-0 | |
| Qatar Open XD | 04/13 17:00 | 1 | Ricardo Walther v Mizuki Oikawa | L | 4-1 | |
| Qatar Open XD | 04/13 09:30 | 1 | Mizuki Oikawa v Jiaji Wu | W | 4-1 | |
| Qatar Open XD | 04/06 14:30 | 1 | Mizuki Oikawa v Lubomir Pistej | W | 4-2 | |
| Qatar Open XD | 04/06 09:30 | 1 | Liao, Cheng-Ting v Mizuki Oikawa | W | 2-4 | |
| Qatar Open XD | 04/05 17:10 | 1 | Cristian Pletea v Mizuki Oikawa | W | 0-4 | |
| Qatar Open XD | 03/21 09:40 | 1 | Mizuki Oikawa v Jaehyun An | L | 1-3 | |
| Qatar Open XD | 03/20 09:40 | 1 | Mizuki Oikawa v Hippler, Tobias | W | 3-0 | |
| Qatar Open XD | 03/15 12:50 | 1 | Mizuki Oikawa v Patryk Zatowka | W | 4-0 | |
| Qatar Open 2019, MS | 02/20 20:30 | - | Simon Gauzy v Mizuki Oikawa | L | 3-0 | |
| Qatar Open 2019, MS | 02/20 19:10 | - | Hugo Calderano v Mizuki Oikawa | L | 3-0 | |
| Qatar Open XD | 11/13 09:40 | 1 | Truls Moregard v Mizuki Oikawa | W | 0-3 | |
| Qatar Open XD | 11/09 18:00 | 1 | Fei Xue v Mizuki Oikawa | L | 3-0 | |
| Qatar Open XD | 11/09 09:30 | 1 | Jonghoon Lim v Mizuki Oikawa | L | 4-0 | |
| Qatar Open XD | 11/09 08:30 | 1 | Mizuki Oikawa v Liao, Cheng-Ting | W | 3-1 | |
| Qatar Open XD | 11/08 17:50 | 1 | Joao Geraldo v Mizuki Oikawa | W | 1-4 | |
| Qatar Open XD | 11/07 15:30 | 1 | Mizuki Oikawa v Fedotov, Petr | W | 4-0 | |
| Qatar Open XD | 11/07 09:39 | - | Hohmeier, Nils v Mizuki Oikawa | W | 0-3 | |
| Qatar Open XD | 10/07 12:45 | 1 | Mizuki Oikawa v Andrea Landrieu | W | 3-2 | |
| Qatar Open XD | 10/07 08:40 | 1 | Mizuki Oikawa v Ismailov, Sadi | W | 3-0 |