Stadium: Centre Court Round: 14 Ground: Hardcourt indoor
| Challenger - Tenerife | 2021/11/01 16:00 | Tallon Griekspoor v Ergi Kirkin | 6-2,6-2 |
| Challenger Losinj | 2021/10/19 08:00 | Raul Brancaccio v Ergi Kirkin | 6-3,3-6,6-2 |
| Challenger Napoli | 2021/10/06 08:00 | Stefano Travaglia v Ergi Kirkin | 7-6,6-3 |
| Challenger Sibiu | 2021/09/30 11:00 | Thanasi Kokkinakis v Ergi Kirkin | 6-1,6-1 |
| Challenger Sibiu | 2021/09/27 12:45 | Ergi Kirkin v Alexey Vatutin | 7-5,4-6,6-1 |
| Challenger Kyiv | 2021/09/11 11:15 | Sebastian Baez v Ergi Kirkin | 6-3,6-2 |
| Challenger Kyiv | 2021/09/09 10:00 | Ergi Kirkin v Stakhovsky, Sergiy | 4-6,6-3,6-2 |
| Challenger Kyiv | 2021/09/07 14:50 | Clement Tabur v Ergi Kirkin | 4-6,6-7 |
| ITF M25 Prague | 2021/10/07 14:05 | Simon, Tobias v Milos Karol | 6-4,4-6,7-6 |
| ITF M25 Prague | 2021/10/06 10:15 | Dominik Kellovsky v Milos Karol | 5-7,4-6 |
| ITF M25 Prague | 2021/10/04 12:20 | Milos Karol v Matyas Cerny | 7-6,7-5 |
| ITF M25 Prague | 2021/10/03 13:00 | Milos Karol v Vitek Horak | 6-0,6-1 |
| ITF M25 Budapest | 2021/09/30 09:00 | Milos Karol v Mate Valkusz | 6-7,0-6 |
| ITF M25 Budapest | 2021/09/29 07:25 | Mark Havlicek v Milos Karol | 2-6,7-6,4-6 |
| ITF M25 Pardubice | 2021/09/23 11:15 | Milos Karol v Henri Squire | 1-6,1-6 |
| ITF M15 Zilina | 2021/09/01 10:00 | Milos Karol v Podzus, Martins | 3-6,6-4,1-6 |