Stadium: Court 2 Round: 25 Ground: Clay
| Challenger - Roma - Calificari | 2021/04/25 09:15 | Matteo Gigante v Pedja Krstin | 4-6,7-5,6-4 |
| Challenger - Belgrad | 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 |
| Challenger - Lima | 2020/11/24 16:30 | Oriol Roca Batalla v Pedja Krstin | 7-5,7-5 |