Stadium: Court 4 Round: 26 Ground: Clay
| ITF M15 Prijedor | 2021/05/11 15:05 | Pedja Krstin v Mateja Janicijevic | 6-1,6-0 |
| Challenger Rome Qual | 2021/04/25 09:15 | Matteo Gigante v Pedja Krstin | 4-6,7-5,6-4 |
| Challenger Belgrade | 2021/04/12 16:00 | Damir Dzumhur v Pedja Krstin | 4-6,6-2,6-3 |
| Challenger St. Petersburg | 2021/03/10 08:30 | Zizou Bergs v Pedja Krstin | 6-2,6-1 |
| Challenger St. Petersburg | 2021/03/03 07:00 | Matthew Ebden v Pedja Krstin | 6-1,6-4 |
| Challenger Potchefstroom | 2021/02/16 10:55 | Lucas Miedler v Pedja Krstin | 6-2,6-0 |
| Challenger Potchefstroom | 2021/02/08 12:55 | Roberto Cid Subervi v Pedja Krstin | 3-6,5-7 |
| ATP Antalya | 2021/01/06 10:50 | Pedja Krstin v Mert Naci Turker | 2-6,1-6 |
| ITF M15 Prijedor | 2021/05/13 07:00 | Alen Rogic-Hadzalic v Maikel De Boes | 6-4,6-7,6-3 |
| ITF M15 Prijedor | 2021/05/11 09:30 | Alen Rogic-Hadzalic v Tim Heger | 6-3,4-6,7-10 |
| ITF M15 Prijedor | 2021/05/10 09:15 | Alen Rogic-Hadzalic v Giulio Colacioppo | 6-1,6-4 |
| ITF M15 Prijedor | 2021/05/09 09:30 | Alen Rogic-Hadzalic v Stevan Popovic | 6-2,6-3 |
| ITF M15 Sibenik | 2021/04/22 07:55 | Alen Rogic-Hadzalic v Gergely Madarasz | 1-6,3-6 |
| ITF M15 Sibenik | 2021/04/21 12:40 | Alen Rogic-Hadzalic v Bozo Barun | 7-6,7-5 |
| ITF M15 Sibenik | 2021/04/20 08:00 | Alen Rogic-Hadzalic v Ondrej Horak | 6-1,6-4 |
| ITF M15 Sibenik | 2021/04/19 10:55 | Alen Rogic-Hadzalic v Jan Kupcic | 7-5,6-3 |