| ITF M15 Bastad | 2025/08/19 11:15 | Conor Gannon v Yannik Kelm | 5-7,6-0,4-6 |
| ITF M15 Ystad | 2025/08/13 08:15 | Brian Bozemoj v Yannik Kelm | 7-5,6-1 |
| ITF M25 Wetzlar | 2025/07/29 11:30 | Nikolai Barsukov v Yannik Kelm | 2-6,6-4,5-2 |
| ITF M25 Metzingen | 2025/07/23 15:33 | Tim Handel v Yannik Kelm | 1-0 |
| ITF M25 Metzingen | 2025/07/22 11:18 | Sydney Zick v Yannik Kelm | 4-6,6-2,0-1 |
| ITF M15 Uslar | 2025/07/17 08:00 | Tadeas Paroulek v Yannik Kelm | 5-7,7-5,6-3 |
| ITF M25 Marburg | 2025/07/02 16:38 | Daniel Masur v Yannik Kelm | 7-5,6-4 |
| ITF M15 Duffel | 2025/06/21 11:00 | Yannik Kelm v Abel Forger | 5-7,2-6 |
| Challenger Porto | 2025/08/25 14:00 | Nicolas Alvarez Varona v Robert Strombachs | 6-0,6-2 |
| Challenger Augsburg | 2025/08/19 13:10 | Robert Strombachs v Matyas Cerny | 6-3,6-7,5-7 |
| Challenger Braunschweig | 2025/07/06 11:00 | Robert Strombachs v Alex Molcan | 5-7,3-6 |
| Challenger Royan | 2025/06/17 11:20 | Arthur Gea v Robert Strombachs | 6-7,6-1,6-1 |
| Davis Cup | 2025/06/13 09:40 | Robert Strombachs v Ilya Snitari | 1-6,2-6 |
| Davis Cup | 2025/06/12 09:40 | Robert Strombachs v Alex De Gabriele | 6-0,2-6,6-4 |
| Davis Cup | 2025/06/11 09:30 | Robert Strombachs v Michael Avetisyan | 6-2,6-2 |
| Davis Cup | 2025/06/10 10:30 | Robert Strombachs v Petar Jovanovic | 6-3,3-6,5-7 |