| Challenger Banja Luka | 2021/09/10 16:00 | Marko Topo v Tomas Martin Etcheverry | 3-6,6-7 |
| Challenger Banja Luka | 2021/09/09 11:55 | Marko Topo v Vitaliy Sachko | 6-1,3-6,7-6 |
| Challenger Banja Luka | 2021/09/07 14:30 | Petrovic, Danilo v Marko Topo | 6-4,6-7,2-6 |
| ITF M15 Allershausen | 2021/09/01 14:35 | Marko Topo v Tim Handel | 5-7,5-7 |
| ITF M15 Bad Waltersdorf | 2021/08/26 07:00 | Marko Topo v Gabriel Decamps | 4-6,5-7 |
| ITF M15 Bad Waltersdorf | 2021/08/24 07:00 | Boehler, Dominik v Marko Topo | 7-6,6-7,4-6 |
| Belgrade, Serbia | 2021/05/23 13:00 | Marko Topo v Federico Coria | 6-4,2-6,0-6 |
| Challenger Belgrade | 2021/04/11 13:05 | Alessandro Giannessi v Marko Topo | 2-6,7-6,6-2 |
| ITF M15 Chornomorsk | 2021/09/03 07:00 | Denis Yevseyev v Oleg Prihodko | 6-3,7-6 |
| ITF M15 Chornomorsk | 2021/09/02 09:55 | Tommaso Compagnucci v Oleg Prihodko | 0-6,6-7 |
| ITF M15 Chornomorsk | 2021/08/31 08:35 | Vlad Andrei Dancu v Oleg Prihodko | 3-6,1-6 |
| ITF M25 Bacau | 2021/08/17 11:15 | Pedro Sakamoto v Oleg Prihodko | 6-3,6-1 |
| ITF M15 Telavi | 2021/08/07 06:30 | Oleg Prihodko v Bondarevskiy, Yan | 7-6,6-3 |
| ITF M15 Telavi | 2021/08/06 06:30 | Yanki Erel v Oleg Prihodko | 6-3,3-6,5-7 |
| ITF M15 Telavi | 2021/08/05 06:30 | Cash, Julian v Oleg Prihodko | 1-6,5-7 |
| ITF M15 Telavi | 2021/08/04 06:30 | Alessandro Ingarao v Oleg Prihodko | 0-6,5-7 |