2023 Upper Austria Open
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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
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| AUT | Dominic Thiem | 93 | 1 |
| FRA | Hugo Gaston | 106 | 2 |
| ARG | Facundo Bagnis | 116 | 3 |
| NED | Gijs Brouwer | 122 | 4 |
| AUT | Filip Misolic | 126 | 5 |
| AUT | Sebastian Ofner | 130 | 6 |
| SUI | Leandro Riedi | 156 | 7 |
| AUT | Dennis Novak | 159 | 8 |
- 1 Rankings as of 24 April 2023.
Other entrants
The following players received wildcards into the singles main draw:
- Austria Sandro Kopp
- Austria Gerald Melzer
- Austria Lukas Neumayer
The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
- Bosnia and Herzegovina Mirza Bašić
- Romania Marius Copil
- Germany Lucas Gerch
- Germany Hendrik Jebens
- Austria Matthias Ujvary
- Switzerland Damien Wenger
Champions
Singles
- Serbia Hamad Međedović def. Austria Filip Misolic 6–2, 6–7(5–7), 6–4.
Doubles
- Monaco Romain Arneodo / Austria Sam Weissborn def. Germany Constantin Frantzen / Germany Hendrik Jebens 6–4, 6–2.