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 | Bastian A U Santander v Martin Katz | 0-6,0-6 |
| ITF M15 Monastir | 2021/09/26 10:30 | Martin Katz v Jiaqi Duan | 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 Takashi Saito | 6-1,6-3 |
| ITF M15 Monastir | 2021/09/22 10:35 | Michel-Alexandre Fortin v Takashi Saito | 1-6,4-6 |
| ITF M15 Ulcinj | 2021/09/14 09:55 | Samuel Vincent Ruggeri v Takashi Saito | 6-1,6-1 |
| ITF M15 Ulcinj | 2021/09/08 08:00 | Marat Deviatiarov v Takashi Saito | 6-3,6-4 |
| ITF M15 Monastir | 2021/06/28 08:00 | Takashi Saito v Valentino De Pellegrin | 6-3,2-6,10-12 |
| ITF M15 Monastir | 2021/06/21 12:30 | Takashi Saito v Jake Van Emburgh | 6-2,3-6,8-10 |
| ITF M15 Monastir | 2021/06/21 08:00 | Takashi Saito v Youcef Rihane | 5-7,6-4,10-3 |
| ITF M15 Monastir | 2021/06/20 08:00 | Takashi Saito v Berk Ilkel | 6-2,6-3 |