Stadium: Platz 1
| ITF M25 Monastir | 2023/11/12 08:00 | Ruben Hartig v Teymuraz Gabashvili | 2-6,0-6 |
| ITF M25 Monastir | 2023/11/06 09:30 | Toby Martin v Ruben Hartig | 6-1,6-1 |
| ITF M25 Monastir | 2023/11/05 08:00 | Ruben Hartig v Nicholas Van Aken | 6-2,6-1 |
| ITF M15 Monastir | 2023/10/23 15:00 | Ruben Hartig v Jaka Protic Zakelj | 1-6,3-6 |
| ITF M15 Vigo | 2023/10/12 13:05 | Nicola Kuhn v Ruben Hartig | 6-0,6-2 |
| ITF M15 Vigo | 2023/10/11 13:40 | Ruben Hartig v Ian Luca Cervantes Tomas | 6-4,6-2 |
| ITF M15 Vigo | 2023/10/09 12:00 | Renan Perdigao v Ruben Hartig | 0-6,6-7 |
| ITF M25 Zaragoza | 2023/10/02 09:40 | Ruben Hartig v Samuel Brosset | 3-6,1-6 |