Stadium: Hard 20 Round: 62 Ground: Hardcourt outdoor
| ITF M15 Heráklion | 2021/11/21 07:00 | Ioannis Papounidis v Sergis Kyratzis | 6-7,4-6 |
| ITF M15 Heráklion | 2021/11/17 13:25 | Sergis Kyratzis v Guy Den Heijer | 6-0,4-6,4-6 |
| ITF M15 Heráklion | 2021/11/07 11:00 | Federico Salomone v Sergis Kyratzis | 6-3,6-2 |
| ITF M15 Heráklion | 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 Káhira | 2021/08/02 12:30 | Yuichiro Inui v Sergis Kyratzis | 6-1,6-3 |
| ITF M15 Káhira | 2021/08/01 12:30 | Sergis Kyratzis v Nicolas Agustin Lema | 3-6,6-2,10-4 |
| ITF M15 Heráklion | 2021/11/21 07:00 | Liam Puttergill v Kai Lemstra | 2-6,1-6 |
| ITF M15 Heráklion | 2021/11/17 08:05 | Alastair Gray v Kai Lemstra | 6-1,7-5 |
| ITF M15 Heráklion | 2021/11/16 07:00 | Max Houkes v Kai Lemstra | 4-6,6-7 |
| ITF M15 Heráklion | 2021/11/15 08:00 | Alan Gleeson v Kai Lemstra | 6-7,3-6 |
| ITF M15 Heráklion | 2021/11/12 10:05 | Kai Lemstra v Peter Fajta | 6-4,1-6,2-6 |
| ITF M15 Heráklion | 2021/11/11 07:00 | Tim Handel v Kai Lemstra | 3-6,6-7 |
| ITF M15 Heráklion | 2021/11/10 09:20 | Karlis Ozolins v Kai Lemstra | 3-6,6-7 |
| ITF M15 Heráklion | 2021/11/09 07:00 | Kai Lemstra v Christopher Patzanovsky | 6-2,6-4 |