Stadium: TK PALILULA C1 Round: 26 Ground: Clay
| ITF M25 Belgrade | 2021/06/30 11:30 | Pedja Krstin v Bogdan Pavel | 6-1,6-1 |
| Challenger Milan | 2021/06/25 13:50 | Pedja Krstin v Hugo Grenier | 4-6,4-6 |
| Challenger Milan | 2021/06/23 11:00 | Pedja Krstin v Manuel Guinard | 6-4,0-6,6-4 |
| Challenger Almaty | 2021/06/09 05:40 | Evan Furness v Pedja Krstin | 6-3,6-1 |
| Challenger Almaty | 2021/06/07 11:30 | Pedja Krstin v Mohamed Safwat | 6-4,6-0 |
| ATP Belgrade | 2021/05/25 13:55 | Alex Molcan v Pedja Krstin | 6-0,6-0 |
| ATP Belgrade | 2021/05/23 10:30 | Pedja Krstin v Soonwoo Kwon | 6-2,3-6,6-1 |
| ITF M15 Prijedor | 2021/05/11 15:05 | Pedja Krstin v Mateja Janicijevic | 6-1,6-0 |
| ITF M25 Belgrade | 2021/06/30 12:45 | Luka Petrovic v Alexandar Lazarov | 0-6,2-6 |
| ITF M15 Skopje | 2021/06/13 08:55 | Miljan Zekic v Alexandar Lazarov | 6-4,7-6 |
| ITF M15 Skopje | 2021/06/12 10:05 | Alexandar Lazarov v Alexis Gautier | 6-4,6-3 |
| ITF M15 Skopje | 2021/06/11 11:15 | Alexandar Lazarov v Ronan Joncour | 6-3,6-1 |
| ITF M15 Skopje | 2021/06/11 07:30 | Alexandar Lazarov v Tomas Jirousek | 6-3,6-4 |
| ITF M15 Skopje | 2021/06/08 10:30 | Alexandar Lazarov v Savriyan Danilov | 6-1,6-2 |
| ITF M15 Skopje | 2021/06/04 08:00 | Alexandar Lazarov v Dalibor Svrcina | 6-7,5-7 |
| ITF M15 Skopje | 2021/06/03 08:00 | Alexandar Lazarov v Admir Kalender | 6-1,6-3 |