Stadium: Court Tsitsipas Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Heraklion | 2021/11/16 07:00 | Michael Zhu v Roi Ginat | 6-2,6-3 |
| ITF - M15 Heraklion | 2021/11/15 08:00 | Michael Zhu v Gian Luca Tanner | 3-6,6-2,10-8 |
| ITF - M25 Portimao | 2021/10/28 13:35 | Michael Zhu v Petros Chrysochos | 2-6,0-6 |
| ITF - M25 Portimao | 2021/10/27 12:30 | Michael Zhu v Alan F R Fierros | 6-4,6-1 |
| ITF - M25 Portimao | 2021/10/26 11:00 | Michael Zhu v Miguel Gomes | 6-4,6-2 |
| ITF - M25 Portimao | 2021/10/25 10:25 | Michael Zhu v Afonso Portugal | 6-2,6-1 |
| ITF - M25 Quinta do Lago | 2021/10/18 12:00 | Michael Zhu v Hillel Rousseau | 4-6,6-3,3-10 |
| ITF - M25 Quinta do Lago | 2021/10/17 15:00 | Michael Zhu v Tim Loosen | 6-3,6-1 |
| ITF - M25 Villers Les Nancy | 2021/11/10 12:10 | Petros Tsitsipas v Sebastian Fanselow | 5-7,2-6 |
| ITF - M25 Saint Dizier | 2021/11/03 13:20 | Petros Tsitsipas v Jeremy Jahn | 4-6,7-6,6-7 |
| Challenger - Napoli | 2021/10/05 12:55 | Filippo Baldi v Petros Tsitsipas | 6-4,3-6,6-4 |
| Challenger - Napoli | 2021/10/04 08:00 | Bogdan Ionut Apostol v Petros Tsitsipas | 6-3,6-2 |
| Challenger - Sibiu | 2021/09/28 08:40 | Damir Dzumhur v Petros Tsitsipas | 6-2,6-0 |
| Cupa Davis | 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 |