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