| UTR Pro Tennis Series - Zadar | 2021/09/28 12:30 | Duje Kekez v Stefanos Sakellaridis | 7-6,6-3 |
| UTR Pro Tennis Series - Zadar | 2021/09/27 11:30 | Duje Kekez v Janos Fekete | 3-6,5-6 |
| ITF M15 - Ulcinj | 2021/09/22 09:25 | Duje Kekez v Felix Gill | 6-7,6-7 |
| ITF M15 - Ulcinj | 2021/09/15 07:55 | Duje Kekez v Timo Legout | 4-6,4-6 |
| ITF M15 - Ulcinj | 2021/09/07 10:10 | Oleksandr Ovcharenko v Duje Kekez | 6-1,4-6,6-4 |
| ITF M15 - Ulcinj | 2021/09/01 10:00 | Aristotelis Thanos v Duje Kekez | 2-6,7-6,6-0 |
| ITF M15 - Novi Sad | 2021/08/03 12:40 | Pedro Boscardin Dias v Duje Kekez | 7-6,6-3 |
| ITF M15 - Novi Sad | 2021/07/29 12:40 | Duje Kekez v Filip Misolic | 4-6,0-6 |
| UTR Pro Tennis Series - Zadar | 2021/09/28 12:30 | Janos Fekete v Christos Keisidis | 6-4,5-3 |
| UTR Pro Tennis Series - Mülheim | 2021/09/25 10:30 | Christos Keisidis v Lawrence Bataljin | 6-4,5-3 |
| UTR Pro Tennis Series - Mülheim | 2021/09/24 08:00 | Christos Keisidis v Jurriaan Bol | 1-6,4-6 |
| UTR Pro Tennis Series - Mülheim | 2021/09/23 11:00 | Christos Keisidis v Artem Podorozhnyi | 5-7,2-5 |
| UTR Pro Tennis Series - Mülheim | 2021/09/22 14:00 | Colin Sinclair v Christos Keisidis | 6-3,6-1 |
| UTR Pro Tennis Series - Mülheim | 2021/09/21 08:00 | Edison Ambarzumjan v Christos Keisidis | 6-2,4-6,5-1 |
| UTR Pro Tennis Series - Sofia | 2021/09/03 07:00 | George Lazarov v Christos Keisidis | 6-4,6-4 |
| UTR Pro Tennis Series - Sofia | 2021/09/02 07:00 | Vladimir Popov v Christos Keisidis | 7-6,6-7,3-6 |