Stadium: Court 2 Round: 54 Ground: Clay
| UTR Pro Tennis Series Mulheim | 2022/10/08 07:30 | Aaron James Williams v Karlo Cubelic | 3-6,6-3,4-6 |
| ITF M25 Kassel | 2023/07/12 11:55 | Hady Habib v Karlo Cubelic | 6-0,6-4 |
| ITF M25 Kassel | 2023/07/11 09:30 | Recek, Dominik v Karlo Cubelic | 2-6,1-6 |
| ITF M25 Marburg | 2023/07/05 10:55 | Karlo Cubelic v Louis Wessels | 7-6,4-6,3-6 |
| ITF M25 Marburg | 2023/07/04 07:55 | Tomas Lanik v Karlo Cubelic | 3-6,6-1,7-10 |
| ITF M25 Marburg | 2023/07/03 08:00 | Noah Thurner v Karlo Cubelic | 7-6,3-6,8-10 |
| ITF M15 Kamen | 2023/06/29 09:00 | Karlo Cubelic v Francois Musitelli | 3-6,4-6 |
| ITF M15 Kamen | 2023/06/28 09:00 | Quentin Folliot v Karlo Cubelic | 2-6,2-6 |
| ITF M15 Kamen | 2023/06/26 10:00 | Karlo Cubelic v Nino Toto | 6-2,6-2 |
| ITF M25 Kassel | 2023/07/10 09:45 | Michael Agwi v Aaron James Williams | 5-7,6-4,10-8 |
| ITF M25 The Hague | 2023/07/02 08:00 | Wojcik, Jakub v Aaron James Williams | 7-6,5-7,11-9 |
| ITF M15 Kamen | 2023/06/26 08:00 | Lambert Ruland v Aaron James Williams | 6-4,6-2 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/18 09:00 | Milan Welte v Aaron James Williams | 6-4,7-6 |
| ITF M15 Duffel | 2023/06/11 11:00 | Aaron James Williams v Lodewijk Weststrate | 2-6,7-6,5-10 |
| German Championship | 2022/12/08 16:00 | Tim Handel v Aaron James Williams | 6-7,7-5,6-1 |
| German Championship | 2022/12/07 13:00 | Aaron James Williams v Thorsten Bertsch | 6-0,5-2 |
| UTR Pro Tennis Series Mulheim | 2022/10/08 07:30 | Aaron James Williams v Karlo Cubelic | 3-6,6-3,4-6 |