Stadium: Court 1 Round: 44 Ground: Hardcourt outdoor
| ITF - M15 Sharm El Sheikh | 2020/02/12 08:00 | Vivero Gonzalez, Pablo v Piotr Grynkowski | 6-3,6-3 |
| ITF - M15 Sharm El Sheikh | 2020/02/11 08:00 | Uzhylovsky, Vladimir v Piotr Grynkowski | 6-4,6-4 |
| ITF - M15 Sharm El Sheikh | 2020/02/10 09:00 | Ernaelsteen, Victor v Piotr Grynkowski | 2-6,2-6 |
| ITF - M15 Sharm El Sheikh | 2020/02/09 10:00 | Hiramatsu, Shinnosuke v Piotr Grynkowski | 3-6,0-6 |
| Milovice, Singles M-ITF-CZE-10A | 2019/11/14 13:45 | Piotr Grynkowski v Vadym Ursu | 2-6,1-6 |
| Milovice, Singles M-ITF-CZE-10A | 2019/11/13 09:00 | Piotr Grynkowski v Samuel Puskar | 6-3,6-0 |
| Milovice, Singles M-ITF-CZE-10A | 2019/11/12 10:30 | Piotr Grynkowski v Jiri Barnat | 6-4,6-4 |
| Milovice, Singles M-ITF-CZE-10A | 2019/11/11 09:00 | Piotr Grynkowski v Patzanovsky, Christopher | 6-1,2-6,10-5 |
| Hong Kong, Simples M-ITF-HKG-01A | 2020/01/08 09:30 | Makoto Ochi v Onishi, Ken | 7-6,6-2 |
| Hong Kong, Simples M-ITF-HKG-01A | 2020/01/07 04:45 | Kousuke Ogura v Onishi, Ken | 5-7,4-6 |
| Hong Kong, Simples M-ITF-HKG-01A | 2020/01/06 02:00 | Shohei Chikami v Onishi, Ken | 4-6,1-6 |
| Te Anau, Simples M-ITF-NZL-01A | 2019/12/30 23:00 | Elliot Benchetrit v Onishi, Ken | 7-5,6-1 |
| Challenger Kobe | 2019/11/06 01:30 | Luke Saville v Onishi, Ken | 6-2,6-2 |
| Taipei, Singles M-ITF-TPE-01A | 2019/07/22 04:00 | Lin, Han-Chih v Onishi, Ken | 6-7,6-3,10-6 |
| Taipei, Singles M-ITF-TPE-01A | 2019/07/15 02:00 | Liao, Hao-Hsiang v Onishi, Ken | 7-6,7-6 |
| Gimcheon, Singles M-ITF-KOR-03A | 2019/06/17 05:20 | Moon, Ju-Hae v Onishi, Ken | 2-6,6-3,10-6 |