Stadium: Court Center Round: 54 Ground: Hardcourt outdoor
| ITF M15 Budapest | 2023/08/29 14:45 | Hamish Stewart v Kevin Humpfner | 6-7,7-5,7-6 |
| ITF M15 Budapest | 2023/08/28 10:00 | Kevin Humpfner v Matas Vasiliauskas | 6-2,6-2 |
| ITF M15 Budapest | 2023/08/27 13:00 | Tyler Stice v Kevin Humpfner | 3-6,6-4,9-11 |
| ITF M15 Trier | 2023/08/23 10:30 | Kevin Humpfner v Benedikt Henning | 1-6,4-6 |
| ITF M15 Trier | 2023/08/21 14:00 | Can Ayral v Kevin Humpfner | 2-6,3-6 |
| ITF M15 Trier | 2023/08/21 09:30 | Dario Drebenstedt v Kevin Humpfner | 1-6,0-6 |
| UTR Pro Florida | 2023/05/13 17:33 | Jerry Barton v Kevin Humpfner | 4-1 |
| UTR Pro Florida | 2023/05/12 18:00 | Mikel Anderson v Kevin Humpfner | 1-6,6-1,0-6 |
| ITF M15 Budapest | 2023/08/27 07:00 | Alfred Almasi v Martin Zeljenka | 6-4,6-3 |
| ITF M25 Poznan | 2023/08/23 09:55 | Georgii Kravchenko v Martin Zeljenka | 6-1,6-1 |
| ITF M25 Poznan | 2023/08/22 09:00 | Martin Zeljenka v Michalis Sakellaridis | 6-0,6-4 |
| ITF M25 Poznan | 2023/08/21 14:25 | Martin Zeljenka v Adam Bajurko | 6-2,6-3 |
| ITF M15 Kottingbrunn | 2023/08/13 12:00 | Maks Meh v Martin Zeljenka | 6-2,6-3 |
| ITF M25 Osijek | 2023/08/06 10:00 | Martin Zeljenka v Marcell Bartakovics | 3-6,3-6 |
| ITF M25 Telfs | 2023/07/16 07:00 | Stepan Pecak v Martin Zeljenka | 6-4,1-6,10-2 |
| ITF M15 Kursumlijska Banja | 2023/06/19 09:25 | Marko Stakusic v Martin Zeljenka | 6-3,6-3 |