| ITF M25 Santa Margherita | 2025/04/29 10:23 | Johan Nikles v Carlos Sanchez Jover | 6-4,5-7,1-5 |
| ITF M25 Angers | 2025/04/22 08:00 | Johan Nikles v Tristan Lamasine | 6-4,1-6,2-6 |
| ITF M15 Heraklion | 2025/04/04 07:00 | Stefanos Sakellaridis v Johan Nikles | 5-7,6-2,6-2 |
| ITF M15 Heraklion | 2025/04/03 10:51 | Alexis Canter v Johan Nikles | 4-6,4-6 |
| ITF M15 Heraklion | 2025/04/02 10:19 | Billy Suarez v Johan Nikles | 1-6,6-7 |
| ITF M15 Heraklion | 2025/03/26 13:29 | Johan Nikles v Guillaume Dalmasso | 5-7,0-6 |
| ITF M25 Les Franqueses | 2025/03/13 08:30 | Johan Nikles v Ilya Ivashka | 2-6,2-6 |
| ITF M25 Trimbach | 2025/03/04 14:30 | Johan Nikles v Jeffrey Von Der Schulenburg | 5-7,4-6 |
| ITF M15 Heraklion | 2025/05/07 12:58 | Gian Gruenig v Rafael De Alba | 4-6,3-6 |
| ITF M25 Nottingham | 2025/04/28 10:30 | Luke Hooper v Gian Gruenig | 6-2,4-6,0-0 |
| ITF M25 Nottingham | 2025/04/27 09:00 | Gian Gruenig v Matt Hulme | 5-7,7-6,1-0 |
| ITF M15 Heraklion | 2025/03/28 08:30 | Gian Gruenig v Stuart Parker | 6-1,1-6,4-6 |
| ITF M25 Trimbach | 2025/03/05 11:45 | Gian Gruenig v Antoine Walch | 4-6,4-6 |
| Challenger Lugano | 2025/02/23 12:45 | Gian Gruenig v Juan Carlos Prado Angelo | 7-5,4-6,4-6 |
| ITF M15 Sharm El Sheikh | 2025/02/11 08:00 | Michal Krajci v Gian Gruenig | 6-1,6-3 |
| ITF M25 Sion | 2024/08/25 13:55 | Janis Raffael Simmen v Gian Gruenig | 7-6,4-6,10-7 |