2023 Upper Austria Open
The 2023 Danube Upper Austria Open was a professional tennis tournament played on clay courts. It was the second edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Mauthausen, Austria between 8 and 14 May 2023.
Singles main-draw entrants
Seeds
- 1 Rankings as of 24 April 2023.
Other entrants
The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
- Mirza Bašić
- Marius Copil
- Lucas Gerch
- Hendrik Jebens
- Matthias Ujvary
- Damien Wenger
Champions
Singles
- Hamad Međedović def. Filip Misolic 6–2, 6–7, 6–4.
Doubles
- Romain Arneodo / Sam Weissborn def. Constantin Frantzen / Hendrik Jebens 6–4, 6–2.