Stadion: Court 21 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 - Heraklion | 2021/11/07 11:00 | Federico Salomone v Sergis Kyratzis | 6-3,6-2 |
| ITF - M15 - Heraklion | 2021/11/02 10:45 | Sergis Kyratzis v Kyle Seelig | 6-4,3-6,3-6 |
| ITF - M15 - Sharm El Sheikh | 2021/10/11 08:30 | Sergis Kyratzis v Simonas Zukauskas | 4-6,4-6 |
| ITF - M15 - Sharm El Sheikh | 2021/10/05 08:00 | Saba Purtseladze v Sergis Kyratzis | 6-4,6-3 |
| ITF - M15 - Kairo | 2021/08/02 12:30 | Yuichiro Inui v Sergis Kyratzis | 6-1,6-3 |
| ITF - M15 - Kairo | 2021/08/01 12:30 | Sergis Kyratzis v Nicolas Agustin Lema | 3-6,6-2,10-4 |
| ITF - M15 - Kairo | 2021/07/25 11:00 | Sergis Kyratzis v Alessandro Ragazzi | 2-6,2-6 |
| ITF - M15 - Sofia | 2021/07/04 10:30 | Christoffer Solberg v Sergis Kyratzis | 6-1,6-3 |
| ITF - M15 - Heraklion | 2021/11/11 07:00 | Guy Den Heijer v Alec Deckers | 4-6,6-7 |
| ITF - M15 - Heraklion | 2021/11/10 07:00 | Guy Den Heijer v Max Houkes | 7-6,6-3 |
| UTR Pro Tennis Series - Amsterdam | 2021/11/07 10:30 | Guy Den Heijer v Sem Verbeek | 6-3,6-3 |
| UTR Pro Tennis Series - Amsterdam | 2021/11/06 12:00 | Deney Wassermann v Guy Den Heijer | 2-6,5-6 |
| UTR Pro Tennis Series - Amsterdam | 2021/11/05 13:30 | Guy Den Heijer v Johann Willems | 7-6,2-6,6-4 |
| UTR Pro Tennis Series - Amsterdam | 2021/11/03 10:30 | Guy Den Heijer v Lawrence Bataljin | 6-0,6-3 |
| UTR Pro Tennis Series - Amsterdam | 2021/11/02 10:30 | Guy Den Heijer v Jip Van Assendelft | 6-4,5-2 |
| UTR Pro Tennis Series - Amsterdam | 2021/11/01 13:30 | Miko Wassermann v Guy Den Heijer | 2-6,5-7 |