Stadium: Court 8 Round: 62 Ground: Hardcourt outdoor
| ITF M15 Monastir | 2021/08/16 07:30 | Federico Salomone v Syed Mohd Agil Syed Naguib | 6-2,6-2 |
| ITF M15 Monastir | 2021/08/15 07:30 | Grigoriy Lomakin v Federico Salomone | 2-6,5-7 |
| ITF M15 Monastir | 2021/08/09 07:30 | Federico Salomone v Drew Baird | 4-6,2-6 |
| ITF M15 Monastir | 2021/08/08 08:30 | Federico Salomone v Nicolas Hollender | 6-3,6-1 |
| ITF M15 L'Aquila | 2021/07/11 11:00 | Federico Salomone v Niccolo Catini | 6-7,3-6 |
| ITF M25 Casinalbo | 2021/07/06 10:45 | Augusto Virgili v Federico Salomone | 6-1,1-6,6-4 |
| ITF M25 Casinalbo | 2021/07/05 07:40 | Nicolo Inserra v Federico Salomone | 7-5,4-6,7-10 |
| ITF M25 Casinalbo | 2021/07/04 10:55 | Federico Salomone v Leonardo Taddia | 7-6,6-2 |
| ITF M15 Monastir | 2021/08/16 07:30 | Kai Lemstra v Blake Ellis | 6-4,6-3 |
| ITF M25 Wetzlar | 2021/08/02 14:00 | Osman Torski v Kai Lemstra | 6-4,0-6,10-5 |
| ITF M25 Most | 2021/05/26 10:15 | Antoine Escoffier v Kai Lemstra | 6-3,7-5 |
| ITF M25 Most | 2021/05/25 10:15 | Kai Lemstra v Edward Hubner | 6-1,6-1 |
| ITF M25 Most | 2021/05/24 08:00 | Kai Lemstra v Niklas Rohrer | 6-3,6-2 |
| ITF M25 Most | 2021/05/23 14:00 | Kai Lemstra v Vojtech Petr | 6-4,6-4 |
| ITF M25 Jablonec Nad Nisou | 2021/05/18 07:30 | Andrew Paulson v Kai Lemstra | 6-3,6-4 |
| ITF M25 Jablonec Nad Nisou | 2021/05/17 07:30 | Jan Jermar v Kai Lemstra | 4-6,4-6 |