Stadium: Court 1 Round: 44 Ground: Hardcourt outdoor
| ITF - M15 Antalya | 2021/06/14 07:30 | Nikolay Sysoev v Daniel Antonio Nunez | 2-6,3-6 |
| ITF M15 - Cancun | 2021/12/13 17:00 | Daniel Antonio Nunez v Fernando A. Z. Cantillana | 6-1,6-4 |
| ITF M15 - Cancun | 2021/12/09 14:00 | Daniel Antonio Nunez v Juan Sebastian Gomez | 2-6,2-6 |
| ITF M15 - Cancun | 2021/12/08 15:00 | Daniel Antonio Nunez v Alex Jones | 6-3,6-0 |
| ITF M15 - Cancun | 2021/12/07 16:00 | Daniel Antonio Nunez v Juan Sebastian Osorio | 6-3,2-6,10-5 |
| ITF M15 - Cancun | 2021/12/05 14:00 | Daniel Antonio Nunez v Cleeve Harper | 6-2,3-6,16-14 |
| ITF M15 - Cancun | 2021/11/30 16:00 | Daniel Antonio Nunez v Nicholas Bybel | 6-2,4-6,8-10 |
| ITF M15 - Cancun | 2021/11/29 14:00 | Daniel Antonio Nunez v Miles Jones | 7-6,6-3 |
| ITF M15 - Cancun | 2021/11/28 14:00 | Daniel Antonio Nunez v Cleeve Harper | 7-5,6-2 |
| ITF M15 - Cancun | 2021/12/13 17:00 | Nikolay Sysoev v Ren Nakamura | 2-6,6-2,10-3 |
| ITF M15 - Cancun | 2021/12/12 15:00 | Nikolay Sysoev v Jose E Yapur | 6-0,6-1 |
| ITF M15 - Cancun | 2021/12/06 14:00 | Nikolay Sysoev v Trent Bryde | 4-6,6-3,5-10 |
| ITF M25 Vero Beach | 2021/10/19 16:00 | Diogo Marques v Nikolay Sysoev | 6-2,6-4 |
| ITF M25 Vero Beach | 2021/10/18 16:00 | Nikolay Sysoev v Jordan Parker | 6-2,6-7,10-7 |
| ITF M15 - Naples | 2021/10/12 13:30 | Tristan McCormick v Nikolay Sysoev | 4-6,6-4,10-5 |
| ITF M15 - Naples | 2021/10/11 14:30 | Xavier Lawrence v Nikolay Sysoev | 7-6,3-6,3-10 |
| ITF M15 - Naples | 2021/10/07 13:30 | Nikolay Sysoev v Juan Ignacio Galarza | 1-6,1-6 |