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