Stadium: Court 4 Round: 62 Ground: Hardcourt outdoor
| ITF M15 Sharm El Sheikh | 2021/10/05 08:00 | Saba Purtseladze v Sergis Kyratzis | 6-4,6-3 |
| ITF M15 Cairo | 2021/08/02 12:30 | Yuichiro Inui v Sergis Kyratzis | 6-1,6-3 |
| ITF M15 Cairo | 2021/08/01 12:30 | Sergis Kyratzis v Nicolas Agustin Lema | 3-6,6-2,10-4 |
| ITF M15 Cairo | 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 Antalya | 2021/06/27 06:30 | Daniil Glinka v Sergis Kyratzis | 3-6,6-4,10-8 |
| ITF M15 Heraklion | 2021/05/23 08:00 | Ugo Blanchet v Sergis Kyratzis | 6-0,6-0 |
| ITF M15 Heraklion | 2021/05/19 11:30 | Sergis Kyratzis v Alexis Musialek | 0-6,4-6 |
| ITF M15 Sharm El Sheikh | 2021/10/10 10:30 | Pavlos Parson v Simonas Zukauskas | 3-6,1-6 |
| ITF M15 Chornomorsk | 2021/08/30 12:30 | Simonas Zukauskas v Federico Campana | 3-6,3-6 |
| ITF M15 Chornomorsk | 2021/08/30 07:00 | Simonas Zukauskas v Kaya Arinc | 6-4,6-2 |
| ITF M15 Oldenzaal | 2021/08/15 10:15 | Simonas Zukauskas v Lewie Lane | 3-6,2-6 |
| ITF M15 Gdynia | 2021/08/09 10:30 | Petr Hajek v Simonas Zukauskas | 6-0,6-1 |
| ITF M15 Gdynia | 2021/08/08 08:00 | Martins Rocens v Simonas Zukauskas | 6-4,5-7,8-10 |
| ITF M25 Wroclaw | 2021/06/27 11:00 | Moritz Trocker v Simonas Zukauskas | 6-4,6-0 |
| ITF M15 Kouvola | 2021/05/27 11:25 | Luca Castelnuovo v Simonas Zukauskas | 6-1,6-3 |