Stadium: Court 3 Round: 25 Ground: Clay
| UTR Pro Tennis Series Barcelona | 2021/08/15 08:00 | Andrey Chepelev v Marat Deviatiarov | 6-1,6-7,2-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/14 08:00 | Fermin Tenti v Marat Deviatiarov | 0-6,1-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/12 10:00 | Bruno P Navarro v Marat Deviatiarov | 4-6,6-4,5-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/10 08:30 | Luc Fomba v Marat Deviatiarov | 5-7,3-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/09 11:00 | Marat Deviatiarov v Federico Zeballos | 5-7,1-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/07 11:00 | Olexiy Kolisnyk v Marat Deviatiarov | 6-4,7-5 |
| UTR Pro Tennis Series Barcelona | 2021/08/06 11:30 | Marat Deviatiarov v Angel G Melgar | 6-2,6-1 |
| UTR Pro Tennis Series Barcelona | 2021/08/05 10:00 | Marat Deviatiarov v Pablo Carretero | 6-0,6-1 |
| 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 |
| ITF M15 Monastir | 2021/05/06 08:25 | Takashi Saito v Alexander Donski | 6-7,1-6 |
| ITF M15 Monastir | 2021/05/05 08:25 | Guido Ivan Justo v Takashi Saito | 1-6,1-6 |
| ITF M15 Monastir | 2021/05/04 08:00 | Takashi Saito v Marcello Serafini | 7-5,2-6,10-8 |
| ITF M15 Monastir | 2021/05/03 12:00 | Takashi Saito v Francesco Cano | 6-0,6-3 |