Stadium: Court 6 Round: 62 Ground: Clay
| ITF M25 Most | 2021/05/23 08:00 | Matuszewski, Piotr v Novansky, Michal | 6-4,1-6,12-10 |
| ITF M25 Prague | 2021/05/09 07:30 | Nejedly, Pavel v Matuszewski, Piotr | 7-5,6-4 |
| ITF - M15 Monastir | 2021/04/12 12:30 | Matuszewski, Piotr v Sean Hodkin | 1-6,0-6 |
| ITF - M15 Monastir | 2021/04/12 08:00 | Yitbarek, Simon v Matuszewski, Piotr | 1-6,2-6 |
| ITF - M15 Monastir | 2021/04/11 10:00 | Jip Van Assendelft v Matuszewski, Piotr | 5-7,4-6 |
| ITF - M15 Monastir | 2021/04/05 09:00 | Ribeiro Marcondes, Igor v Matuszewski, Piotr | 7-6,6-3 |
| ITF - M15 Monastir | 2021/04/04 10:30 | Pereira, Miguel Fernando v Matuszewski, Piotr | 3-6,3-6 |
| ITF - M15 Sharm El Sheikh | 2021/02/07 11:00 | Matuszewski, Piotr v Lorenzo Rottoli | 4-6,0-6 |
| ITF M25 Most | 2021/05/23 08:00 | Tomas Balazi v Theo Arribage | 0-6,5-7 |
| ITF - M15 Monastir | 2021/05/02 12:00 | Theo Arribage v Frinzi, Mattia | 6-7,1-6 |
| ITF - M15 Monastir | 2021/04/25 09:00 | Theo Arribage v Viktor Jovic | 4-6,6-4,7-10 |
| ITF - M25 Reus | 2021/04/12 07:30 | Theo Arribage v Arthur Fils | 6-7,6-7 |
| ITF - M15 Poitiers | 2021/03/14 10:30 | George Loffhagen v Theo Arribage | 6-1,6-1 |
| ITF - M25 Vale Do Lobo | 2021/03/07 14:00 | Theo Arribage v Voljacques, Hugo | 2-6,6-3,5-10 |
| ITF - M15 Bressuire | 2021/01/17 12:25 | Pontico, Hugo v Theo Arribage | 6-4,6-3 |
| ITF - M15 Monastir | 2021/01/10 10:00 | Theo Arribage v Edouard Villoslada | 2-6,1-6 |