Estádio: Hard 20 Round: 62 Ground: Hardcourt outdoor
| ITF - M15 Heraklion | 2021/06/06 11:00 | Michel-Alexandre Fortin v Christos Keisidis | 0-6,0-6 |
| ITF - M15 Heraklion | 2021/05/31 06:30 | Mattia Bellucci v Christos Keisidis | 6-4,6-3 |
| ITF - M15 Heraklion | 2021/05/24 06:30 | Christos Keisidis v William Griffith | 2-6,3-6 |
| ITF - M15 Heraklion | 2021/05/23 08:00 | Matic Dimic v Christos Keisidis | 2-6,4-6 |
| ITF - M15 Heraklion | 2021/05/19 06:30 | Christos Keisidis v Aristotelis Thanos | 2-6,2-6 |
| 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 | 2021/05/30 09:00 | Matteo De Vincentis v Alexander Gaponenko | 6-3,6-1 |
| ITF - M15 Heraklion | 2021/05/23 10:00 | Yannick Stephan Born v Alexander Gaponenko | 6-4,7-6 |
| ITF - M15 Jerusalém | 2021/05/12 10:05 | Alexander Gaponenko v Sahar Simon | 2-6,3-6 |
| ITF - M15 Jerusalém | 2021/05/11 06:30 | Dylan Salton v Alexander Gaponenko | 6-4,6-3 |
| ITF - M15 Jerusalém | 2021/05/10 07:00 | Arthur Bernabe v Alexander Gaponenko | 6-7,2-6 |
| ITF - M15 Jerusalém | 2021/05/09 08:30 | Tom Saporta v Alexander Gaponenko | 3-6,5-7 |
| ITF - M15 Ramat HaSharon | 2021/05/04 07:00 | Dylan Salton v Alexander Gaponenko | 6-7,7-6,10-8 |
| ITF - M15 Ramat HaSharon | 2021/05/03 07:00 | Shahar Gabay v Alexander Gaponenko | 0-6,0-6 |