Stadium: Court 6 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 - Monastir | 2021/10/04 13:00 | Mikail Alimli v Nikita Volonski | 6-4,1-6,3-10 |
| ITF - M15 - Monastir | 2021/10/04 09:00 | Rishabdev Raman v Nikita Volonski | 1-6,2-6 |
| UTR Pro Tennis Series - Canberra | 2021/04/24 04:30 | Nikita Volonski v Lachlan Rowing | 0-0 |
| UTR Pro Tennis Series - Canberra | 2021/04/23 03:00 | Nikita Volonski v Scott Puodziunas | 1-6,4-6 |
| UTR Pro Tennis Series - Canberra | 2021/04/21 00:00 | Nikita Volonski v Omar Jasika | 4-6,4-6 |
| UTR Pro Tennis Series - Canberra | 2021/04/19 23:30 | Nikita Volonski v Dayne Kelly | 1-6,2-6 |
| UTR Pro Tennis Series - Canberra | 2021/04/18 23:30 | Casey Hoole v Nikita Volonski | 7-5,5-3 |
| UTR Pro Tennis Series - Canberra | 2021/04/18 02:00 | Nikita Volonski v Scott Webster | 6-4,6-1 |
| ITF - M15 - Monastir | 2021/10/02 08:30 | Ugo Blanchet v Guy Den Ouden | 6-4,6-3 |
| ITF - M15 - Monastir | 2021/10/01 08:00 | Ryota Tanuma v Guy Den Ouden | 5-7,3-6 |
| ITF - M15 - Monastir | 2021/09/30 08:00 | Guy Den Ouden v Lukas Neumayer | 7-6,6-3 |
| ITF - M15 - Monastir | 2021/09/29 10:45 | Guy Den Ouden v Mohamed Amine Aissa Khelifa | 6-0,6-3 |
| ITF - M15 - Monastir | 2021/09/22 08:00 | Guy Den Ouden v Ryota Tanuma | 6-7,2-6 |
| ITF M15 - Allershausen | 2021/09/05 11:00 | Guy Den Ouden v Mick Veldheer | 6-0,6-4 |
| ITF M15 - Allershausen | 2021/09/04 13:10 | Guy Den Ouden v Mats Rosenkranz | 6-4,4-6,6-4 |
| ITF M15 - Allershausen | 2021/09/03 12:35 | Guy Den Ouden v Juan Ignacio Galarza | 7-5,6-3 |