Stadium: Hard Court 4 Round: 62 Ground: Hardcourt outdoor
| ITF - M15 Héraklion | 2021/05/23 08:00 | Dimic, Matic v Keisidis, Christos | 2-6,4-6 |
| ITF - M15 Héraklion | 2021/05/19 06:30 | Keisidis, Christos v Aristotelis Thanos | 2-6,2-6 |
| ITF - M15 Héraklion | 2020/03/10 08:00 | Ioannis Xilas v Keisidis, Christos | 0-6,6-4,10-6 |
| ITF - M15 Héraklion | 2020/03/04 12:10 | Keisidis, Christos v Cornut-Chauvinc, Antoine | 5-7,2-6 |
| ITF - M15 Héraklion | 2020/02/26 11:25 | Kalovelonis, Markos v Keisidis, Christos | 5-7,6-4,6-4 |
| ITF - M15 Héraklion | 2020/02/25 08:00 | Keisidis, Christos v Nicolas Tepmahc | 6-3,4-6,13-11 |
| ITF - M15 Héraklion | 2020/02/24 08:30 | Mathys Erhard v Keisidis, Christos | 4-6,6-3,12-14 |
| ITF - M15 Héraklion | 2020/02/20 08:25 | Guy Den Heijer v Keisidis, Christos | 6-4,4-6,6-3 |
| ITF - M15 Héraklion | 2021/05/23 08:30 | Jimmy Yang v Griffith, William | 2-6,0-6 |
| ITF - M15 Héraklion | 2021/05/18 08:00 | Griffith, William v Soghoyan, Artur | 4-6,6-1,7-10 |
| ITF - M15 Héraklion | 2021/05/17 08:00 | Griffith, William v Lorenzo Joaquin Rodriguez | 6-4,1-6,10-6 |
| UTR Pro Tennis Series Atlanta | 2021/04/18 14:30 | Griffith, William v Gurmendi, Alexis | 6-4,6-3 |
| UTR Pro Tennis Series Atlanta | 2021/04/17 12:30 | Griffith, William v Murphy Cassone | 6-7,6-3,5-3 |
| UTR Pro Tennis Series Atlanta | 2021/04/16 12:30 | Jonny Ho v Griffith, William | 2-6,4-5 |
| UTR Pro Tennis Series Atlanta | 2021/04/15 15:30 | Dugo Reyes, Jose Antonio v Griffith, William | 1-6,0-6 |
| UTR Pro Tennis Series Atlanta | 2021/04/14 12:30 | Nicholas Heng v Griffith, William | 6-7,3-6 |