Stadium: Court 6 Round: 25 Ground: Clay
| ITF - M25 Madrid | 2021/09/14 07:00 | Manish Sureshkumar v Mario G Fernandez | 6-4,6-3 |
| ITF - M15 Bad Waltersdorf | 2021/08/22 07:00 | Lorenzo Vatteroni v Mario G Fernandez | 7-5,6-4 |
| ITF - M15 Warmbad-Villach | 2021/08/18 14:35 | Mario G Fernandez v Lukas Krainer | 6-7,6-2,1-6 |
| ITF - M15 Warmbad-Villach | 2021/08/17 11:00 | Paul Valsecchi v Mario G Fernandez | 2-6,3-6 |
| ITF - M15 Warmbad-Villach | 2021/08/16 16:00 | Matic Dimic v Mario G Fernandez | 5-7,3-6 |
| ITF - M15 Warmbad-Villach | 2021/08/16 07:00 | Maximilian Figl v Mario G Fernandez | 5-7,1-6 |
| ITF - M15 Castelo Branco | 2021/07/25 11:00 | David Marrero v Mario G Fernandez | 4-6,7-5,10-8 |
| ITF - M25 Idanha-A-Nova | 2021/07/20 09:50 | Mario G Fernandez v Ben Jones | 2-6,2-6 |
| Challenger - Varsovia | 2021/08/26 13:05 | Michael Vrbensky v Jeroen Vanneste | 6-0,4-6,6-3 |
| Challenger - Varsovia | 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 |