| UTR Pro Tennis Series Zadar | 2021/11/20 09:00 | Janos Fekete v Lawrence Bataljin | 6-3,5-7,6-7 |
| UTR Pro Tennis Series Zadar | 2021/11/19 11:30 | Tadic, Vladan v Lawrence Bataljin | 4-6,4-6 |
| UTR Pro Tennis Series Zadar | 2021/11/18 09:00 | Lawrence Bataljin v Domagoj Biljesko | 1-6,1-6 |
| UTR Pro Tennis Series Zadar | 2021/11/15 13:30 | Lawrence Bataljin v Pjevcevic, Petar | 1-6,6-2,6-3 |
| UTR Pro Tennis Series Zadar | 2021/11/14 13:00 | Michalis Sakellaridis v Lawrence Bataljin | 6-7,3-5 |
| UTR Pro Tennis Series Amsterdam | 2021/11/06 09:00 | Lawrence Bataljin v Edison Ambarzumjan | 3-6,6-2,1-6 |
| UTR Pro Tennis Series Amsterdam | 2021/11/05 09:00 | Jip Van Assendelft v Lawrence Bataljin | 7-6,6-2 |
| UTR Pro Tennis Series Amsterdam | 2021/11/04 12:00 | Miko Wassermann v Lawrence Bataljin | 6-1,6-3 |
| UTR Pro Tennis Series Zadar | 2021/11/20 09:00 | Dimitrov, Martin v Rumler, Robert | 2-6,4-4 |
| UTR Pro Tennis Series Zadar | 2021/11/19 12:00 | Alexander Chepik v Rumler, Robert | 3-6,1-5 |
| UTR Pro Tennis Series Zadar | 2021/11/18 12:00 | Rumler, Robert v Vladimir Popov | 6-2,5-1 |
| UTR Pro Tennis Series Zadar | 2021/11/16 12:00 | Rumler, Robert v Kekez, Duje | 2-6,4-6 |
| UTR Pro Tennis Series Zadar | 2021/11/15 12:00 | Rumler, Robert v Valerii Naumenko | 6-0,6-0 |
| UTR Pro Tennis Series Portoroz | 2021/08/29 09:30 | Rumler, Robert v Egor Agafonov | 7-6,6-1 |
| UTR Pro Tennis Series Portoroz | 2021/08/26 10:00 | Rumler, Robert v Gal Emersic Potocnik | 6-2,6-1 |
| UTR Pro Tennis Series Portoroz | 2021/08/26 07:00 | Rumler, Robert v Giacomo Revelli | 3-6,4-6 |