Stadium: Campo Centrale Round: 19 Ground: Clay
| ITF M15 Antalya | 2022/11/25 06:30 | Ryan Nijboer v Alexander Weis | 6-7,3-6 |
| ITF M15 Skopje | 2021/06/04 10:25 | Alexander Weis v Ryan Nijboer | 6-7,6-7 |
| Challenger - Rooma | 2023/04/23 13:15 | Stefano Travaglia v Ryan Nijboer | 6-7,6-2,5-7 |
| ITF M15 Telde | 2023/04/20 09:00 | Ryan Nijboer v Alejandro Manzanera Pertusa | 4-6,6-4,3-6 |
| ITF M15 Telde | 2023/04/18 12:20 | Ryan Nijboer v Aleksandr Braynin | 6-2,5-7,6-4 |
| ITF M15 Telde | 2023/04/12 08:00 | Ryan Nijboer v Georgii Kravchenko | 2-6,4-6 |
| ITF M25 Reus | 2023/04/06 11:00 | Ryan Nijboer v Alex M Pujolras | 4-6,5-7 |
| ITF M25 Reus | 2023/04/05 07:55 | Ryan Nijboer v Pedro Araujo | 5-7,6-2,6-1 |
| Challenger Las Franquesas del Vallés | 2023/03/20 11:15 | Billy Harris v Ryan Nijboer | 6-3,3-6,6-2 |
| Challenger Las Franquesas del Vallés | 2023/03/19 15:40 | Ryan Nijboer v Maxime Chazal | 6-4,7-5 |
| Challenger - Rooma | 2023/04/23 13:40 | Ergi Kirkin v Alexander Weis | 2-6,7-5,5-7 |
| ITF M25 Santa Margherita | 2023/04/21 09:00 | Julian Ocleppo v Alexander Weis | 5-7,7-6,6-3 |
| ITF M25 Santa Margherita | 2023/04/20 07:55 | Kai Wehnelt v Alexander Weis | 4-6,6-1,6-7 |
| ITF M25 Santa Margherita | 2023/04/19 09:50 | Mikalai Haliak v Alexander Weis | 3-6,4-6 |
| ITF M25 Santa Margherita | 2023/04/18 11:45 | Jakub Wojcik v Alexander Weis | 4-6,4-6 |
| ITF M25 Santa Margherita | 2023/04/12 10:15 | Alexander Weis v Giorgio Tabacco | 6-2,4-6,6-7 |
| ITF M25 Santa Margherita | 2023/04/10 14:00 | Alexander Weis v Fabrizio Andaloro | 6-3,6-4 |
| Challenger Girona | 2023/03/26 08:30 | Alexander Weis v Abedallah Shelbayh | 7-6,3-6,6-7 |