Stadium: Center Court Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Heraklion | 2020/03/10 08:00 | Ioannis Xilas v Christos Keisidis | 0-6,6-4,10-6 |
| ITF - M15 Heraklion | 2020/03/04 12:10 | Christos Keisidis v Antoine Cornut-Chauvinc | 5-7,2-6 |
| ITF - M15 Heraklion | 2020/02/26 11:25 | Markos Kalovelonis v Christos Keisidis | 5-7,6-4,6-4 |
| ITF - M15 Heraklion | 2020/02/25 08:00 | Christos Keisidis v Nicolas Tepmahc | 6-3,4-6,13-11 |
| ITF - M15 Heraklion | 2020/02/24 08:30 | Mathys Erhard v Christos Keisidis | 4-6,6-3,12-14 |
| ITF - M15 Heraklion | 2020/02/20 08:25 | Guy Den Heijer v Christos Keisidis | 6-4,4-6,6-3 |
| ITF - M15 Heraklion | 2020/02/18 13:05 | Jonas Trinker v Christos Keisidis | 2-6,7-6,4-6 |
| ITF - M15 Heraklion | 2020/02/09 08:00 | Lodewijk Weststrate v Christos Keisidis | 6-4,6-2 |
| ITF - M15 Heraklion | 2021/05/18 06:30 | Aristotelis Thanos v Eric Morris | 7-6,6-0 |
| UTR Pro Tennis Series - Pazardzhik | 2021/04/10 13:30 | Alexander Lazov v Aristotelis Thanos | 6-4,5-4 |
| UTR Pro Tennis Series - Pazardzhik | 2021/04/09 12:30 | Aristotelis Thanos v Pierre Faivre | 6-2,6-5 |
| UTR Pro Tennis Series - Pazardzhik | 2021/04/08 08:30 | Aristotelis Thanos v Ilya Snitari | 2-6,7-6,4-6 |
| UTR Pro Tennis Series - Pazardzhik | 2021/04/06 11:30 | Aristotelis Thanos v Petr Nesterov | 7-5,6-3 |
| UTR Pro Tennis Series - Pazardzhik | 2021/04/05 10:00 | Thomas Laurent v Aristotelis Thanos | 6-3,6-2 |
| UTR Pro Tennis Series - Pazardzhik | 2021/04/03 07:00 | Aristotelis Thanos v Ilya Snitari | 5-7,0-0 |
| UTR Pro Tennis Series - Pazardzhik | 2021/04/02 10:00 | Aristotelis Thanos v Lucas Bouquet | 7-5,1-6,3-6 |