| Kaohsiung Masters | 09/27 11:00 | 5 | Yu Huang v Koga, Minoru | L | 2-1 | |
| Thailand Int. | 03/12 04:00 | - | Yu Jen Chi v Koga, Minoru | W | 1-2 | |
| Thailand Int. | 03/11 00:50 | - | Takuma Obayashi v Koga, Minoru | W | 0-2 | |
| Thailand Int. | 03/10 08:10 | - | Koga, Minoru v Hyeok Jin Jeon | W | 2-0 | |
| Thailand Int. | 03/09 07:45 | - | Sholeh Aidil v Koga, Minoru | W | 0-2 | |
| Thailand Int. | 03/08 12:50 | - | Hai Dang Nguyen v Koga, Minoru | W | 0-2 | |
| Estonie Int. - | 01/13 15:40 | - | Koga, Minoru v Magnus Johannesen | L | 0-2 | |
| Estonie Int. - | 01/13 08:45 | - | Koga, Minoru v Elias Bracke | W | 2-0 | |
| Irish Open | 11/18 10:20 | - | Magnus Johannesen v Koga, Minoru | L | 2-0 | |
| Irish Open | 11/17 20:20 | - | Burestedt, Felix v Koga, Minoru | W | 0-2 | |
| Irish Open | 11/17 11:40 | - | Koga, Minoru v Nikolov, Daniel | W | 2-0 | |
| Norwegian Int. | 11/12 09:30 | - | Chia Hao Lee v Koga, Minoru | L | 2-1 | |
| Norwegian Int. | 11/11 17:20 | - | Koga, Minoru v Torjussen, J. | W | 2-0 | |
| Norwegian Int. | 11/11 09:40 | - | Verma, Siril v Koga, Minoru | W | 0-2 | |
| Polish Int. | 09/24 15:00 | - | Jan Louda v Koga, Minoru | L | 2-1 | |
| Polish Int. | 09/24 08:40 | - | Koga, Minoru v Koshiro Moriguchi | W | 2-0 | |
| Polish Int. | 09/23 14:40 | - | Koga, Minoru v Panitchaphon Teeraratsakul | W | 2-0 | |
| Polish Int. | 09/22 13:00 | - | Koga, Minoru v Shmundyak, Oleksandar | W | 2-0 | |
| Belgian International 2019, MS | 09/16 08:40 | - | Joran Kweekel v Koga, Minoru | W | 0-2 | |
| Belgian International 2019, MS | 09/15 15:20 | - | Koga, Minoru v Luka Wraber | W | 2-0 | |
| Belgian International 2019, MS | 09/15 07:00 | - | Lucas Claerbout v Koga, Minoru | W | 0-2 | |
| Open de Suède | 01/18 10:00 | - | Koga, Minoru v Burestedt, Felix | L | 0-2 | |
| Open de Suède | 01/17 18:00 | - | Bundgaard, Martin v Koga, Minoru | W | 0-2 | |
| Open de Suède | 01/17 12:00 | - | Li Yang Su v Koga, Minoru | W | 1-2 | |
| Estonie Int. - | 01/11 09:40 | - | Koga, Minoru v Takuma Obayashi | L | 1-2 | |
| Estonie Int. - | 01/10 10:00 | - | Koga, Minoru v Schaenzler, Lars | W | 2-0 | |
| Malaysia Int. | 11/14 10:30 | - | Jun Hao Leong v Koga, Minoru | L | 2-1 | |
| Malaysia Int. | 11/13 00:30 | - | Koga, Minoru v Vasigaran, Eveshgaran | W | 2-0 | |
| Indonesia International Challenge 2019, MS | 10/22 11:55 | 6 | Ha, Young Woong v Koga, Minoru | L | 2-1 | |
| Indonesia Masters | 10/02 11:00 | 5 | Koga, Minoru v Soo, Teck Zhi | L | 0-2 |