Stadium: Court 09 Round: 25 Ground: Clay
| San Marino, San Marino | 2021/08/08 09:45 | Alexander Shevchenko v Donati, Matteo | 6-3,3-6,7-5 |
| Iasi, Romania | 2021/07/14 11:05 | Felipe Meligeni Rodrigues Alves v Donati, Matteo | 6-3,6-3 |
| Iasi, Romania | 2021/07/12 09:55 | Stefan Palosi v Donati, Matteo | 4-6,4-6 |
| ITF M25 Wroclaw | 2021/06/27 14:00 | Donati, Matteo v Dominik Kellovsky | 6-2,6-7,6-10 |
| ITF M15 Cairo | 2021/04/15 13:20 | Krainer, L. v Donati, Matteo | 6-2,4-6,6-4 |
| ITF M15 Cairo | 2021/04/14 14:20 | Alex Barrena v Donati, Matteo | 5-7,1-6 |
| ITF - M15 Porec | 2021/03/09 11:20 | Donati, Matteo v Aleksandre Bakshi | 7-6,6-0 |
| ITF - M15 Porec | 2021/03/08 11:30 | Donati, Matteo v Gianmarco Ferrari | 6-0,6-1 |
| ITF M25 Kottingbrunn | 2021/07/19 11:50 | Manda, Calin v Rohrer, Niklas | 6-2,6-3 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Habsuda, Simon v Rohrer, Niklas | 1-6,5-7 |
| ITF M25 Telfs | 2021/07/12 12:05 | Lukas Palovic v Rohrer, Niklas | 6-4,6-3 |
| ITF M25 Telfs | 2021/07/11 09:00 | Christian Fellin v Rohrer, Niklas | 2-6,3-6 |
| ITF M25 Most | 2021/05/24 08:00 | Kai Lemstra v Rohrer, Niklas | 6-3,6-2 |
| ITF M25 Most | 2021/05/23 08:00 | Rohrer, Niklas v Lukas Pokorny | 7-6,6-3 |
| ITF M25 Prague | 2021/05/09 13:30 | Lucas Bouquet v Rohrer, Niklas | 6-1,6-3 |
| ITF - M15 Antalya | 2021/04/11 07:00 | Marco De Rossi v Rohrer, Niklas | 6-3,6-2 |