Stadium: Court 9 Round: 23 Ground: Grass
| Challenger Phoenix | 2022/03/16 19:10 | Aleksandar Vukic v Daniel Altmaier | 1-6,6-3,4-6 |
| Challenger Oeiras | 2023/05/20 10:00 | Facundo Diaz Acosta v Aleksandar Vukic | 6-4,6-3 |
| Challenger Oeiras | 2023/05/19 12:00 | Aleksandar Vukic v Felipe Meligeni Rodrigues Alves | 5-7,6-4,6-4 |
| Challenger Oeiras | 2023/05/18 10:00 | Aleksandar Vukic v Alexander Ritschard | 7-5,6-3 |
| Challenger Oeiras | 2023/05/17 12:45 | Aleksandar Vukic v Gerard Campana Lee | 6-4,4-6,6-3 |
| Challenger Oeiras | 2023/05/16 13:40 | Aleksandar Vukic v Frederico Ferreira Silva | 7-6,6-3 |
| Challenger Busan | 2023/05/13 06:00 | Brandon Holt v Aleksandar Vukic | 6-7,1-6 |
| Challenger Busan | 2023/05/12 02:00 | Aleksandar Vukic v Christopher Eubanks | 6-7,7-6,6-4 |
| Challenger Busan | 2023/05/10 03:30 | Aleksandar Vukic v Sho Shimabukuro | 7-6,6-4 |
| ATP Rome | 2023/05/13 16:10 | Daniel Altmaier v Frances Tiafoe | 6-3,5-7,3-6 |
| ATP Rome | 2023/05/11 09:00 | Giulio Zeppieri v Daniel Altmaier | 6-7,6-4,0-6 |
| ATP Rome | 2023/05/09 09:00 | Daniel Altmaier v Elias Ymer | 7-6,6-0 |
| ATP Rome | 2023/05/08 10:15 | Daniel Altmaier v Jozef Kovalik | 6-2,6-4 |
| ATP Madrid | 2023/05/03 19:25 | Daniel Altmaier v Borna Coric | 3-6,3-6 |
| ATP Madrid | 2023/05/02 09:00 | Jaume Munar v Daniel Altmaier | 3-6,0-6 |
| ATP Madrid | 2023/04/30 19:00 | Daniel Altmaier v Yannick Hanfmann | 7-6,6-3 |
| ATP Madrid | 2023/04/28 09:00 | Daniel Altmaier v Oscar Otte | 6-4,7-5 |