Stadium: Court 9 Round: 25 Ground: Clay
| ITF M15 Ostrava | 2021/11/23 11:00 | Bozo Barun v Adam Pavlasek | 0-6,2-6 |
| ITF M15 Ostrava | 2021/11/22 10:20 | Bozo Barun v Christopher Patzanovsky | 7-6,3-6,10-7 |
| ITF M15 Ostrava | 2021/11/21 13:30 | Bozo Barun v Simon Sedliak | 7-6,6-3 |
| ITF M15 Zlatibor | 2021/09/14 08:00 | Bozo Barun v Petar Pjevcevic | 6-4,0-6,9-11 |
| ITF M15 Ulcinj | 2021/08/30 07:30 | Bozo Barun v Ioannis Xilas | 4-6,1-6 |
| ITF M15 Novi Sad | 2021/07/27 09:00 | Bozo Barun v Charles Broom | 4-6,6-7 |
| ITF M15 Novi Sad | 2021/07/26 12:00 | Tomas Jirousek v Bozo Barun | 6-3,0-6,4-10 |
| ITF M15 Novi Sad | 2021/07/25 15:00 | Bozo Barun v Alan Postay | 6-2,6-3 |
| Challenger Bari | 2021/11/21 09:00 | Victor Vlad Cornea v Petros Tsitsipas | 7-6,7-5 |
| ITF M15 Heraklion | 2021/11/17 10:50 | Michael Zhu v Petros Tsitsipas | 5-7,7-6,6-2 |
| 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 |
| Davis Cup | 2021/09/18 09:00 | Petros Tsitsipas v Ricardas Berankis | 1-6,3-6 |