Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Monastir | 2021/09/28 08:00 | Lohithaksha Bathrinath v Martin Katz | 6-7,0-6 |
| ITF - M15 Monastir | 2021/09/27 09:00 | Utreras Santander, Bastian Alonso v Martin Katz | 0-6,0-6 |
| ITF - M15 Monastir | 2021/09/26 10:30 | Martin Katz v Duan, Jia Qi | 6-4,6-3 |
| ITF M25 Eupen | 2021/09/08 09:50 | Buvaysar Gadamauri v Martin Katz | 6-3,6-3 |
| ITF M15 Huy | 2021/08/24 15:35 | Martin Katz v Deney Wassermann | 4-6,1-6 |
| ITF M25 Koksijde | 2021/08/18 11:05 | Martin Katz v Aidan Mchugh | 2-6,6-7 |
| ITF - M15 Monastir | 2021/09/23 08:00 | Lilian Marmousez v Saito, Takashi | 6-1,6-3 |
| ITF - M15 Monastir | 2021/09/22 10:35 | Fortin, Michel-Alexandre v Saito, Takashi | 1-6,4-6 |
| ITF M15 Ulcinj | 2021/09/14 09:55 | Samuel Vincent Ruggeri v Saito, Takashi | 6-1,6-1 |
| ITF M15 Ulcinj | 2021/09/08 08:00 | Deviatiarov, Marat v Saito, Takashi | 6-3,6-4 |
| ITF - M15 Monastir | 2021/06/28 08:00 | Saito, Takashi v de Pellegrin, Valentino | 6-3,2-6,10-12 |
| ITF - M15 Monastir | 2021/06/21 12:30 | Saito, Takashi v van Emburgh, Jake | 6-2,3-6,8-10 |
| ITF - M15 Monastir | 2021/06/21 08:00 | Saito, Takashi v Rihane, Youcef | 5-7,6-4,10-3 |
| ITF - M15 Monastir | 2021/06/20 08:00 | Saito, Takashi v Berk Ilkel | 6-2,6-3 |