Stadium: Central Round: 25 Ground: Clay
| ITF M15 Palmanova | 2019/01/24 11:30 | Jahn, Jeremy v Carlos Lopez Montagud | 6-7,1-6 |
| ITF M25 Gandia | 2021/07/22 16:00 | Merida Aguilar, Daniel v Carlos Lopez Montagud | 6-4,6-1 |
| ITF M25 Gandia | 2021/07/21 10:35 | Carlos Lopez Montagud v Molino, Javier | 6-4,6-2 |
| ITF M25 The Hague | 2021/06/29 09:00 | Yu Hsiou Hsu v Carlos Lopez Montagud | 6-1,3-6,6-3 |
| ITF M25 The Hague | 2021/06/28 08:45 | Carlos Lopez Montagud v Michiel de Krom | 6-1,6-3 |
| ITF M25 The Hague | 2021/06/27 08:00 | Carlos Lopez Montagud v Fons Van Sambeek | 6-4,6-2 |
| ITF M25 Alkmaar | 2021/06/24 15:00 | Nicolas Alvarez Varona v Carlos Lopez Montagud | 5-7,6-3,6-2 |
| ITF M25 Alkmaar | 2021/06/23 12:10 | Louis Wessels v Carlos Lopez Montagud | 3-6,6-4,4-6 |
| ITF M25 Alkmaar | 2021/06/21 18:30 | Carlos Lopez Montagud v Dhoe, Benjamin | 6-3,6-4 |
| 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 |
| ITF M25 Alkmaar | 2021/06/23 10:55 | Marvin Moeller v Jahn, Jeremy | 6-2,6-0 |
| DTB German Pro Series | 2020/06/12 08:30 | Jahn, Jeremy v Ehrenschneider, Nino | 4-6,1-6 |
| DTB German Pro Series | 2020/06/11 08:00 | Jahn, Jeremy v Marvin Moeller | 6-3,0-6,3-6 |