Stadium: Campo 2 Round: 25 Ground: Clay
| ITF - Ueberlingen M25 | 2021/08/18 10:10 | Jeremy Jahn v Alexander Cozbinov | 3-6,7-6,1-6 |
| ITF - Bolzano M25 | 2021/08/03 13:50 | Andrea Gola v Jeremy Jahn | 4-6,6-2,6-3 |
| ITF - Denia M25 | 2021/07/27 17:25 | Carlos Lopez Montagud v Jeremy Jahn | 6-4,6-2 |
| ITF - Gandia M25 | 2021/07/21 16:00 | Jordi Mas De Ugarte v Jeremy Jahn | 6-4,6-3 |
| Challenger Amersfoort | 2021/07/12 09:00 | Jeremy Jahn v Johan Nikles | 2-6,3-6 |
| Challenger Amersfoort | 2021/07/11 11:40 | Jeremy Jahn v Arjun Kadhe | 6-2,6-7,6-4 |
| ITF - Marburg M25 | 2021/07/06 16:40 | Alexander Donski v Jeremy Jahn | 6-2,6-2 |
| ITF - Haga M25 | 2021/06/29 09:00 | Jeremy Jahn v Javier Barranco Cosano | 2-6,3-6 |
| Challenger Trieste | 2021/07/29 14:50 | Damir Dzumhur v Pedja Krstin | 6-3,6-1 |
| Challenger Trieste | 2021/07/28 08:00 | Pedja Krstin v Viktor Durasovic | 6-3,6-2 |
| Challenger Tampere | 2021/07/21 15:00 | Botic Van De Zandschulp v Pedja Krstin | 6-3,6-1 |
| Challenger Tampere | 2021/07/19 15:30 | JC Aragone v Pedja Krstin | 4-6,4-6 |
| Challenger Iasi | 2021/07/13 07:00 | Pedja Krstin v Dimitar Kuzmanov | 2-6,2-6 |
| ITF - Belgrad M25 | 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 |