Stadium: Campo 2 Round: 25 Ground: Clay
| ITF M25 Ueberlingen | 2021/08/18 10:10 | Jahn, Jeremy v Cozbinov, Alexander | 3-6,7-6,1-6 |
| ITF M25 Bolzano | 2021/08/03 13:50 | Andrea Gola v Jahn, Jeremy | 4-6,6-2,6-3 |
| ITF M25 Denia | 2021/07/27 17:25 | Carlos Lopez Montagud v Jahn, Jeremy | 6-4,6-2 |
| ITF M25 Gandia | 2021/07/21 16:00 | Mas de Ugarte, Jordi v Jahn, Jeremy | 6-4,6-3 |
| Challenger Amersfoort | 2021/07/12 09:00 | Jahn, Jeremy v Johan Nikles | 2-6,3-6 |
| Challenger Amersfoort | 2021/07/11 11:40 | Jahn, Jeremy v Arjun Kadhe | 6-2,6-7,6-4 |
| ITF M25 Marburg | 2021/07/06 16:40 | Alexander Donski v Jahn, Jeremy | 6-2,6-2 |
| ITF M25 The Hague | 2021/06/29 09:00 | Jahn, Jeremy v Javier Barranco Cosano | 2-6,3-6 |
| Challenger Trieste | 2021/07/29 14:50 | Damir Dzumhur v Krstin, Pedja | 6-3,6-1 |
| Challenger Trieste | 2021/07/28 08:00 | Krstin, Pedja v Viktor Durasovic | 6-3,6-2 |
| Challenger Tampere | 2021/07/21 15:00 | Botic Van De Zandschulp v Krstin, Pedja | 6-3,6-1 |
| Challenger Tampere | 2021/07/19 15:30 | Aragone, JC v Krstin, Pedja | 4-6,4-6 |
| Iasi, Romania | 2021/07/13 07:00 | Krstin, Pedja v Dimitar Kuzmanov | 2-6,2-6 |
| ITF M25 Belgrade | 2021/06/30 11:30 | Krstin, Pedja v Bogdan Pavel | 6-1,6-1 |
| Milan, Italy | 2021/06/25 13:50 | Krstin, Pedja v Hugo Grenier | 4-6,4-6 |
| Milan, Italy | 2021/06/23 11:00 | Krstin, Pedja v Manuel Guinard | 6-4,0-6,6-4 |