| UTR Pro Tennis Series Zadar | 2021/10/01 11:00 | Kalender, Admir v Jose A R Rodriguez | 6-4,6-3 |
| UTR Pro Tennis Series Zadar | 2021/09/30 08:00 | Kalender, Admir v Rogic Hadzalic, Alen | 2-6,6-4,5-6 |
| UTR Pro Tennis Series Zadar | 2021/09/29 12:00 | Borna Devald v Kalender, Admir | 5-7,6-2,1-5 |
| UTR Pro Tennis Series Zadar | 2021/09/28 08:00 | Myroslav Bondar v Kalender, Admir | 2-6,2-6 |
| ITF M15 Ulcinj | 2021/09/12 09:30 | Alexandre Aubriot v Kalender, Admir | 6-1,6-3 |
| ITF M15 Bad Waltersdorf | 2021/08/25 08:50 | Krainer, L. v Kalender, Admir | 6-4,3-6,6-2 |
| ITF M15 Bad Waltersdorf | 2021/08/23 13:00 | Kalender, Admir v Scott, Fletcher | 6-4,6-2 |
| ITF M15 Bad Waltersdorf | 2021/08/23 07:00 | Luigi Sorrentino v Kalender, Admir | 2-6,1-6 |
| UTR Pro Tennis Series Zadar | 2021/10/01 12:30 | Pjevcevic, Petar v Maric, Filip | 4-6,6-2,6-3 |
| UTR Pro Tennis Series Zadar | 2021/09/30 14:00 | Pjevcevic, Petar v Lawrence Bataljin | 6-1,6-5 |
| UTR Pro Tennis Series Zadar | 2021/09/29 09:30 | Yanais Laurent v Pjevcevic, Petar | 6-2,6-2 |
| UTR Pro Tennis Series Zadar | 2021/09/28 09:30 | Matic, Mile v Pjevcevic, Petar | 2-6,2-5 |
| Pirot, Singles M-ITF-SRB-05A | 2021/09/20 08:00 | Minarik, Kristof v Pjevcevic, Petar | 7-5,6-4 |
| Pirot, Singles M-ITF-SRB-05A | 2021/09/19 09:30 | Danilo Ilic v Pjevcevic, Petar | 1-6,1-6 |
| ITF M15 Zlatibor | 2021/09/16 09:40 | Fabian Marozsan v Pjevcevic, Petar | 6-3,7-5 |
| ITF M15 Zlatibor | 2021/09/15 13:20 | Aleksa Mardjonovic v Pjevcevic, Petar | 6-1,3-6,3-6 |