Stadium: Centre Court Round: 25 Ground: Hardcourt outdoor
| ITF M25 Nonthaburi | 2020/01/26 07:50 | Issei Okamura v Palaphoom Kovapitukted | 4-6,1-6 |
| ITF M15 Hong Kong | 2020/01/08 06:50 | Adam El Mihdawy v Issei Okamura | 4-6,6-2,6-3 |
| ITF M15 Hong Kong | 2020/01/07 02:00 | Issei Okamura v Chayanon Kaewsuto | 6-0,6-0 |
| ITF M15 Hong Kong | 2020/01/06 02:00 | Issei Okamura v Douglas Geiwald | 6-2,6-1 |
| ITF M15 Cancun | 2019/11/15 19:35 | Issei Okamura v Mariano Kestelboim | 4-6,1-6 |
| ITF M15 Cancun | 2019/11/05 16:35 | Mateus Alves v Issei Okamura | 6-3,6-2 |
| ITF M15 Changwon | 2019/10/15 03:10 | Cheong-Eui Kim v Issei Okamura | 6-4,4-6,6-4 |
| ITF M25 Toowoomba | 2019/10/08 01:50 | Issei Okamura v Tristan Schoolkate | 3-6,6-2,4-6 |
| ITF M15 Milovice | 2019/11/14 13:45 | Piotr Grynkowski v Vadym Ursu | 2-6,1-6 |
| ITF M15 Milovice | 2019/11/13 09:00 | Piotr Grynkowski v Samuel Puskar | 6-3,6-0 |
| ITF M15 Milovice | 2019/11/12 10:30 | Piotr Grynkowski v Jiri Barnat | 6-4,6-4 |
| ITF M15 Milovice | 2019/11/11 09:00 | Piotr Grynkowski v Christopher Patzanovsky | 6-1,2-6,10-5 |
| ITF M15 Opava | 2019/10/30 09:00 | Piotr Grynkowski v Jaroslav Pospisil | 6-7,0-6 |
| ITF M15 Opava | 2019/10/29 09:00 | Piotr Grynkowski v Tim Van Der Horst | 6-2,6-2 |
| ITF M15 Opava | 2019/10/28 12:00 | Piotr Grynkowski v Daniel Vrba | 7-5,6-2 |
| ITF M15 Liberec | 2019/10/22 12:00 | Adrian Bodmer v Piotr Grynkowski | 6-4,7-5 |