Stadium: Court 12 Round: 54 Ground: Clay
| ITF M25 Telfs | 2023/07/16 10:30 | Ruben Hartig v Serafin Zund | 4-6,6-3,7-10 |
| ITF M25 Esch/Alzette | 2023/07/10 14:00 | Stijn Slump v Ruben Hartig | 6-2,6-4 |
| ITF M25 Esch/Alzette | 2023/07/10 08:45 | Ruben Hartig v Victor Bini | 3-6,6-2,10-8 |
| ITF M25 Esch/Alzette | 2023/07/09 09:25 | Can Ayral v Ruben Hartig | 5-7,3-6 |
| ITF M25 Marburg | 2023/07/04 09:25 | Philipp Pavlenko v Ruben Hartig | 6-4,3-6,10-3 |
| ITF M25 Marburg | 2023/07/03 08:00 | Ruben Hartig v Tim Heger | 7-5,1-6,10-8 |
| ITF M15 Kamen | 2023/06/28 14:55 | Ruben Hartig v Mats Rosenkranz | 6-7,2-6 |
| ITF M15 Kamen | 2023/06/26 14:00 | Ruben Hartig v Lukas Janousek | 6-4,6-1 |
| ITF M15 Casablanca | 2023/06/20 09:00 | Vladislav Ivanov v Christian Lerby | 1-6,6-3,10-3 |
| ITF M15 Casablanca | 2023/06/19 12:00 | Christian Lerby v Niccolo Baroni | 6-3,6-1 |
| ITF M15 Norman | 2022/10/27 17:40 | Christian Lerby v Yuta Kikuchi | 4-6,2-6 |
| ITF M15 Norman | 2022/10/26 15:00 | Christian Lerby v Yannik Rahman | 6-4,6-0 |
| ITF M25 Norman | 2022/10/25 07:00 | Franco Ribero v Christian Lerby | 1-6,3-6 |
| ITF M25 Norman | 2022/10/24 06:00 | Nikolas Moceanu v Christian Lerby | 1-6,5-7 |
| UTR Pro Tennis Series Newport Beach | 2022/10/09 20:06 | Maciej Rajski v Christian Lerby | 6-2,5-4 |
| UTR Pro Tennis Series Newport Beach | 2022/10/08 23:00 | Christian Lerby v Lucas Brown | 6-4,6-5 |