Stadium: Court 2 Round: 25 Ground: Clay
| ITF - M15 - Antalya | 2021/10/22 07:00 | Nicholas David Ionel v Nicolae Frunza | 6-4,6-1 |
| ITF - M15 - Antalya | 2021/10/21 07:00 | Santiago De La Fuente v Nicolae Frunza | 1-6,7-5,0-6 |
| ITF - M15 - Antalya | 2021/10/20 10:20 | Gabriele Maria Noce v Nicolae Frunza | 4-6,2-6 |
| ITF - M15 - Antalya | 2021/10/13 09:20 | Bogdan Ionut Apostol v Nicolae Frunza | 7-6,7-6 |
| Challenger - Sibiu | 2021/09/27 09:50 | Nicolae Frunza v Nicholas David Ionel | 6-4,3-6,6-7 |
| Challenger - Sibiu | 2021/09/26 11:10 | Oleksii Krutykh v Nicolae Frunza | 2-6,6-7 |
| Challenger - Bukurešť | 2021/09/21 07:00 | Nicolae Frunza v Filip Horansky | 6-7,4-6 |
| Challenger - Banja Luka | 2021/09/05 09:00 | Nicolae Frunza v Martin Cuevas | 4-6,6-7 |
| ITF - M15 Kazaň | 2021/10/13 13:25 | Sergey Fomin v Konstantin Zhzhenov | 7-5,6-4 |
| ITF - M15 Sozopol | 2021/09/16 09:35 | Martin Krumich v Konstantin Zhzhenov | 6-2,6-4 |
| ITF - M15 Sozopol | 2021/09/14 10:00 | Konstantin Zhzhenov v Baran Cengiz | 6-7,6-4,6-1 |
| ITF - M15 Kazaň | 2021/03/09 11:30 | Konstantin Zhzhenov v Evgeny Philippov | 5-7,3-6 |