Stadion: Court 1 Ground: Clay
| Challenger - Napoli | 2021/10/03 10:40 | Francesco Forti v Bogdan Ionut Apostol | 6-7,7-5,3-6 |
| ITF - M15 - Sozopol | 2021/09/16 08:05 | Ryan James Storrie v Bogdan Ionut Apostol | 6-3,6-1 |
| ITF - M15 - Sozopol | 2021/09/14 14:00 | Yanaki Milev v Bogdan Ionut Apostol | 6-7,6-7 |
| ITF - M15 - Curtea de Arges | 2021/08/10 07:00 | Bogdan Ionut Apostol v Vlad Andrei Dancu | 3-6,4-6 |
| ITF - M15 - Curtea de Arges | 2021/08/09 07:00 | Bogdan Ionut Apostol v Louis Allen | 6-2,6-3 |
| ITF - M25 - Pitesti | 2021/08/03 09:50 | Chun Hsin Tseng v Bogdan Ionut Apostol | 3-6,6-3,7-5 |
| ITF - M25 - Kottingbrunn | 2021/07/23 08:30 | Bogdan Ionut Apostol v Lenny Hampel | 1-6,6-4,5-7 |
| ITF - M25 - Kottingbrunn | 2021/07/22 08:00 | Martins Podzus v Bogdan Ionut Apostol | 6-3,1-6,4-6 |
| Challenger - Sibiu | 2021/09/28 08:40 | Damir Dzumhur v Petros Tsitsipas | 6-2,6-0 |
| Davis Cup | 2021/09/18 09:00 | Petros Tsitsipas v Ricardas Berankis | 1-6,3-6 |
| Challenger - Cassis | 2021/09/05 12:45 | Ramkumar Ramanathan v Petros Tsitsipas | 6-4,6-4 |
| ITF - M15 - Oldenzaal | 2021/08/19 11:20 | Daniel De Jonge v Petros Tsitsipas | 6-2,6-2 |
| ITF - M15 - Oldenzaal | 2021/08/18 15:00 | Petros Tsitsipas v Gabriel Alejandro Hidalgo | 7-5,6-2 |
| Challenger - Meerbusch | 2021/08/08 12:05 | Nerman Fatic v Petros Tsitsipas | 6-1,7-6 |
| ITF - M25 - Bozen | 2021/08/04 08:25 | Petros Tsitsipas v Andrea Gola | 2-6,2-6 |
| ITF - M25 - Bozen | 2021/08/03 15:35 | Petros Tsitsipas v Jonas Greif | 6-3,6-2 |