Stadium: Court 6 Round: 25 Ground: Hardcourt outdoor
| 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 | Danilo Petrovic 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 | Dominik Boehler v Marko Topo | 7-6,6-7,4-6 |
| ATP Belgrade | 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 Monastir | 2021/11/22 13:30 | Xian Yao Zhou v Maxime Dubouch | 3-6,6-4,6-10 |
| ITF M15 Monastir | 2021/11/22 09:00 | Anthony Turchi v Maxime Dubouch | 1-6,2-6 |
| ITF M15 Monastir | 2021/11/15 14:00 | Alexis Boureau v Maxime Dubouch | 2-6,6-1,10-8 |
| ITF M15 Monastir | 2021/11/15 09:00 | Joe Misrahi v Maxime Dubouch | 6-7,4-6 |
| ITF M15 Monastir | 2021/11/14 11:00 | Amaan Siddiqui v Maxime Dubouch | 1-6,1-6 |
| ITF M25 Saint Dizier | 2021/11/01 11:00 | Maxime Dubouch v Matt Ponchet | 6-7,2-6 |
| ITF M25 Saint Dizier | 2021/10/31 09:00 | Hendrik Jebens v Maxime Dubouch | 6-7,6-7 |
| ITF M25 Sarreguemines | 2021/10/26 09:50 | Maxime Dubouch v Hugo Pontico | 0-6,3-6 |