Stadium: Court 6 Round: 44 Ground: Clay
| ITF M15 Warmbad-Villach | 2021/08/17 13:25 | Matteo Donati v Niklas Rohrer | 6-3,6-3 |
| 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 Prague | 2021/05/09 13:30 | Lucas Bouquet v Niklas Rohrer | 6-1,6-3 |
| ITF M15 Pescara | 2021/08/15 11:30 | Luca Castagnola v Alessandro Ragazzi | 2-6,7-5,10-12 |
| ITF M25 Bolzano | 2021/08/03 16:20 | Marco Bortolotti v Luca Castagnola | 6-1,3-6,6-2 |
| ITF M25 Bolzano | 2021/08/02 13:15 | Igor Solomatin v Luca Castagnola | 6-7,2-6 |
| ITF M25 Bolzano | 2021/08/02 07:00 | Nicolo Pozzani v Luca Castagnola | 4-6,6-2,8-10 |
| ITF M15 Antalya | 2021/06/01 09:30 | Giovanni Fonio v Luca Castagnola | 6-1,1-6,7-6 |
| ITF M15 Antalya | 2021/05/23 07:00 | Daniil Glinka v Luca Castagnola | 6-3,3-6,10-5 |
| ITF M15 Monastir | 2021/05/10 13:30 | Luca Castagnola v Omni Kumar | 6-7,2-6 |
| ITF M15 Monastir | 2021/05/10 09:00 | Luca Castagnola v Taketo Takamisawa | 4-6,6-3,11-9 |