Stadium: Court 12 Round: 62 Ground: Clay
| ITF M15 Gdynia | 2021/08/08 08:00 | Svyatoslav Ilnytskyy v Bartlomiej Andrzejczak | 6-2,6-0 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/04 15:00 | Svyatoslav Ilnytskyy v Maks Kasnikowski | 2-6,3-6 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/02 14:25 | Svyatoslav Ilnytskyy v Tomas Lanik | 6-3,6-0 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/02 08:00 | Adam Bronka v Svyatoslav Ilnytskyy | 5-7,0-6 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/01 11:30 | Dario Drebenstedt v Svyatoslav Ilnytskyy | 5-7,4-6 |
| ITF M25 Wroclaw | 2021/06/27 09:30 | Edouard Villoslada v Svyatoslav Ilnytskyy | 6-7,6-3,10-6 |
| ITF M15 Novomoskovsk | 2021/05/31 06:15 | Simon A Ivanov v Svyatoslav Ilnytskyy | 6-1,6-3 |
| ITF M15 Novomoskovsk | 2021/05/24 12:00 | Svyatoslav Ilnytskyy v Aliaksandr Liaonenka | 4-6,3-6 |
| ITF M15 Gdynia | 2021/08/08 08:00 | Mikolaj Szmyrgala v Antonin Bolardt | 2-6,2-6 |
| ITF M25 Most | 2021/05/27 07:55 | Antonin Bolardt v Markus Eriksson | 6-4,6-4 |
| ITF M25 Most | 2021/05/26 09:35 | Antonin Bolardt v Marek Gengel | 7-6,6-0 |
| ITF M25 Most | 2021/05/25 10:10 | Antonin Bolardt v Jakub Beran | 6-1,6-1 |
| ITF M25 Most | 2021/05/24 09:00 | Antonin Bolardt v Mark Havlicek | 6-2,6-2 |
| ITF M25 Most | 2021/05/23 15:00 | Antonin Stepanek v Antonin Bolardt | 2-6,4-6 |
| ITF M25 Jablonec Nad Nisou | 2021/05/17 08:30 | Antonin Bolardt v Filip Duda | 0-6,3-6 |
| ITF M25 Prague | 2021/05/10 10:30 | Antonin Bolardt v Patrik Rikl | 1-6,4-6 |