Stadium: Court 3 Round: 62 Ground: Clay
| Challenger Braunschweig Qual | 2017/07/08 08:00 | Jannik Opitz v Alexander Mannapov | 3-6,6-4,2-6 |
| ITF Germany F4 | 2016/06/18 12:30 | David Eisenzapf v Jannik Opitz | 6-2,6-1 |
| ITF Germany F16 | 2015/10/14 10:15 | Mats Moraing v Jannik Opitz | 6-3,6-1 |
| Challenger Losinj | 2021/10/17 10:00 | Admir Kalender v Fabien Reboul | 6-7,0-6 |
| UTR Pro Tennis Series Zadar | 2021/10/03 09:30 | Admir Kalender v Christos Keisidis | 6-2,6-0 |
| UTR Pro Tennis Series Zadar | 2021/10/02 08:30 | Admir Kalender v Petar Pjevcevic | 6-3,6-1 |
| UTR Pro Tennis Series Zadar | 2021/10/01 11:00 | Admir Kalender v Jose A R Rodriguez | 6-4,6-3 |
| UTR Pro Tennis Series Zadar | 2021/09/30 08:00 | Admir Kalender v Alen Rogic-Hadzalic | 2-6,6-4,5-6 |
| UTR Pro Tennis Series Zadar | 2021/09/29 12:00 | Borna Devald v Admir Kalender | 5-7,6-2,1-5 |
| UTR Pro Tennis Series Zadar | 2021/09/28 08:00 | Myroslav Bondar v Admir Kalender | 2-6,2-6 |
| ITF M15 Ulcinj | 2021/09/12 09:30 | Alexandre Aubriot v Admir Kalender | 6-1,6-3 |