| Daily Premier Tour | 2020/04/06 11:22 | Firsin, Grigorii v Igor Yanushkevich | 7-6,6-4 |
| Daily Premier Tour | 2020/04/06 22:27 | Firsin, Grigorii v 라스카, 아네이 | 2-6,3-6 |
| Daily Premier Tour | 2020/04/06 11:22 | Firsin, Grigorii v Igor Yanushkevich | 7-6,6-4 |
| Daily Premier Tour | 2020/04/06 00:50 | Geraskin, Nikita v Firsin, Grigorii | 6-3,6-3 |
| Daily Premier Tour | 2020/04/02 22:21 | Geraskin, Nikita v Firsin, Grigorii | 4-6,4-6 |
| Daily Premier Tour | 2020/03/20 09:53 | Riman, Edward v Firsin, Grigorii | 6-3,6-4 |
| Exhibition | 2020/03/19 22:47 | Firsin, Grigorii v Geraskin, Nikita | 2-6,4-6 |
| Burgas, Singles Qualifying M-ITF-BUL-05A | 2019/10/07 07:00 | Firsin, Grigorii v 보르산, 도루 주니어 | 3-6,0-6 |
| Daily Premier Tour | 2020/04/06 11:22 | Firsin, Grigorii v Igor Yanushkevich | 7-6,6-4 |