2025 Upper Austria Open
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The 2025 Danube Upper Austria Open powered by SKE was a professional tennis tournament played on clay courts. It was the fourth edition of the tournament which was part of the 2025 ATP Challenger Tour. It took place in Mauthausen, Austria between 28 April and 4 May 2025.
Singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| BEL | Raphaël Collignon | 81 | 1 |
| BRA | Thiago Monteiro | 94 | 2 |
| CRO | Marin Čilić | 109 | 3 |
| ITA | Fabio Fognini | 112 | 4 |
| CHI | Tomás Barrios Vera | 128 | 5 |
| JPN | Taro Daniel | 131 | 6 |
| SUI | Jérôme Kym | 133 | 7 |
| ARG | Thiago Agustín Tirante | 134 | 8 |
- 1 Rankings as of 21 April 2025.
Other entrants
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw as a special exempt:
The following player received entry into the singles main draw through the Next Gen Accelerator programme:
The following player received entry into the singles main draw as an alternate:
The following players received entry from the qualifying draw:
- Switzerland Mika Brunold
- Bulgaria Dimitar Kuzmanov
- Czech Republic Tadeáš Paroulek
- Switzerland Jakub Paul
- Austria David Pichler
- Brazil Thiago Seyboth Wild
The following player received entry as a lucky loser:
Champions
Singles
- Chile Cristian Garín def. Chile Tomás Barrios Vera 3–6, 6–1, 6–4.
Doubles
- Austria Nico Hipfl / Switzerland Jérôme Kym def. United States Ryan Seggerman / United Kingdom David Stevenson 7–5, 3–6, [10–2].