| UTR Pro Tennis Series - Zadar | 2021/11/19 12:00 | Alen Bill v Martin Dimitrov | 7-5,3-6,5-6 |
| UTR Pro Tennis Series - Zadar | 2021/11/18 14:30 | Drazen Petrovic v Martin Dimitrov | 6-4,6-4 |
| UTR Pro Tennis Series - Zadar | 2021/11/16 09:00 | Myroslav Bondar v Martin Dimitrov | 1-6,4-6 |
| UTR Pro Tennis Series - Zadar | 2021/11/15 09:00 | Martin Dimitrov v Dorian Vasung | 6-3,0-0 |
| UTR Pro Tennis Series - Brasov | 2021/10/30 11:00 | Martin Dimitrov v Dragos Constantin Ignat | 1-6,2-5 |
| UTR Pro Tennis Series - Brasov | 2021/10/29 10:00 | Tudor Vlad Vasilache v Martin Dimitrov | 1-6,1-6 |
| UTR Pro Tennis Series - Brasov | 2021/10/28 07:00 | Yurii Dzhavakian v Martin Dimitrov | 6-2,5-2 |
| UTR Pro Tennis Series - Brasov | 2021/10/26 10:00 | Vlad Andrei Dancu v Martin Dimitrov | 6-3,6-3 |
| UTR Pro Tennis Series - Zadar | 2021/11/19 12:00 | Alexander Chepik v Robert Rumler | 3-6,1-5 |
| UTR Pro Tennis Series - Zadar | 2021/11/18 12:00 | Robert Rumler v Vladimir Popov | 6-2,5-1 |
| UTR Pro Tennis Series - Zadar | 2021/11/16 12:00 | Robert Rumler v Duje Kekez | 2-6,4-6 |
| UTR Pro Tennis Series - Zadar | 2021/11/15 12:00 | Robert Rumler v Valerii Naumenko | 6-0,6-0 |
| UTR Pro Tennis Series - Portoroz | 2021/08/29 09:30 | Robert Rumler v Egor Agafonov | 7-6,6-1 |
| UTR Pro Tennis Series - Portoroz | 2021/08/26 10:00 | Robert Rumler v Gal Emersic Potocnik | 6-2,6-1 |
| UTR Pro Tennis Series - Portoroz | 2021/08/26 07:00 | Robert Rumler v Giacomo Revelli | 3-6,4-6 |
| UTR Pro Tennis Series - Portoroz | 2021/08/25 07:00 | Robert Rumler v Paras Dahiya | 7-6,3-6,6-5 |