Estádio: Court 1 Round: 14 Ground: Clay
| Challenger - Prostejov | 2021/06/14 08:30 | Alex Rybakov v Jeroen Vanneste | 7-6,7-6 |
| ITF - M25 Madrid | 2021/09/15 11:25 | Mario G Fernandez v Jeroen Vanneste | 6-2,7-6 |
| Challenger - Varsóvia | 2021/08/26 13:05 | Michael Vrbensky v Jeroen Vanneste | 6-0,4-6,6-3 |
| Challenger - Varsóvia | 2021/08/25 10:40 | Jeroen Vanneste v Alexander Shevchenko | 6-3,2-6,7-5 |
| ITF - M25 Telfs | 2021/07/14 07:55 | Jeroen Vanneste v Bogdan Ionut Apostol | 2-6,3-6 |
| Challenger - Salzburgo | 2021/07/05 09:00 | Jeroen Vanneste v Alexander Erler | 4-6,2-6 |
| Challenger - Salzburgo | 2021/07/04 11:10 | Yosuke Watanuki v Jeroen Vanneste | 3-6,2-6 |
| Challenger - Prostejov | 2021/06/14 08:30 | Alex Rybakov v Jeroen Vanneste | 7-6,7-6 |
| Challenger - Prostejov | 2021/06/13 11:25 | Adam Jurajda v Jeroen Vanneste | 6-4,6-7,1-6 |
| Challenger - Szczecin | 2021/09/16 17:00 | Nicola Kuhn v Alex Rybakov | 6-2,6-2 |
| Challenger - Szczecin | 2021/09/14 10:00 | Danilo Petrovic v Alex Rybakov | 1-6,2-6 |
| Challenger - Szczecin | 2021/09/13 09:00 | Jesper De Jong v Alex Rybakov | 6-3,3-6,2-6 |
| Challenger - Szczecin | 2021/09/12 09:00 | Szymon Kielan v Alex Rybakov | 2-6,6-2,3-6 |
| Challenger - Kiev | 2021/09/09 08:00 | Sebastian Baez v Alex Rybakov | 6-4,6-2 |
| Challenger - Kiev | 2021/09/07 07:00 | Alex Rybakov v Mohamed Aziz Dougaz | 5-7,6-0,6-3 |
| Challenger - Kiev | 2021/09/06 08:00 | Alex Rybakov v Aleksandr Braynin | 6-3,6-4 |
| Challenger - Kiev | 2021/09/05 08:00 | Alex Rybakov v Nikita Mashtakov | 6-2,6-2 |