Stadium: Court 09 Round: 25 Ground: Clay
| 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 |
| ITF - M25 Idanha-A-Nova | 2021/07/19 13:00 | Diego F Flores v Mario G Fernandez | 6-2,3-6,5-10 |
| ITF - M25 Idanha-A-Nova | 2021/07/18 13:00 | Mario G Fernandez v Guilherme Sousa Severin | 6-3,6-4 |
| ITF - M25 Idanha-A-Nova | 2021/07/11 10:30 | Miguel Damas v Mario G Fernandez | 4-6,7-6,10-7 |
| ITF - M15 Cairo | 2021/08/06 09:55 | Lukas Krainer v Quentin Folliot | 4-6,1-6 |
| ITF - M15 Cairo | 2021/08/05 09:20 | Lukas Krainer v Constantin Bittoun Kouzmine | 6-1,6-2 |
| ITF - M15 Cairo | 2021/08/04 09:10 | Karim-Mohamed Maamoun v Lukas Krainer | 1-6,2-6 |
| ITF - M15 Cairo | 2021/07/29 08:00 | Mathieu Perchicot v Lukas Krainer | 7-6,5-7,6-1 |
| ITF - M15 Cairo | 2021/07/28 09:40 | Lukas Krainer v Saud Alhogbani | 6-3,6-1 |
| ITF - M15 Monastir | 2021/07/13 09:30 | Jeremy Beale v Lukas Krainer | 6-3,6-3 |
| ITF - M15 Monastir | 2021/07/06 08:00 | Lukas Krainer v Adam El Mihdawy | 1-6,4-6 |
| ITF - M15 Helsinki | 2021/05/31 07:00 | Lukas Krainer v Adrien Burdet | 5-7,3-6 |