Stadium: Pista 2 Round: 25 Ground: Clay
| Challenger Warsaw | 2021/08/26 13:05 | Michael Vrbensky v Jeroen Vanneste | 6-0,4-6,6-3 |
| Challenger Warsaw | 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 Salzburg | 2021/07/05 09:00 | Jeroen Vanneste v Alexander Erler | 4-6,2-6 |
| Challenger Salzburg | 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 |
| ITF M15 Antalya | 2021/05/05 08:25 | Jeroen Vanneste v Yanki Erel | 7-6,5-7,5-7 |
| Challenger Seville | 2021/09/06 19:00 | Roberto Ortega-Olmedo v Adrian Andreev | 6-7,0-6 |
| Challenger Mallorca | 2021/09/02 14:30 | Joao Sousa v Roberto Ortega-Olmedo | 6-3,6-3 |
| Challenger Mallorca | 2021/08/31 10:00 | Roberto Ortega-Olmedo v Nicolas Mejia | 7-5,7-5 |
| Challenger Prague | 2021/08/23 10:00 | Roberto Ortega-Olmedo v Alexander Ritschard | 1-6,1-6 |
| ITF M25 Frankfurt am Main | 2021/08/11 09:00 | Roberto Ortega-Olmedo v Matthew Romios | 2-6,4-6 |
| Challenger Segovia | 2021/07/27 14:00 | Roberto Ortega-Olmedo v Cem Ilkel | 6-3,6-7,4-6 |
| Challenger Pozoblanco | 2021/07/20 17:10 | Tim Van Rijthoven v Roberto Ortega-Olmedo | 6-3,6-7,7-5 |
| Challenger Iasi | 2021/07/13 10:50 | Matija Pecotic v Roberto Ortega-Olmedo | 4-6,6-0,6-1 |