2005 Austrian Open – Singles

In the 2005 Austrian Open Singles, Nicolás Massú was the defending champion, but lost in the semifinals to Fernando Verdasco.

Gastón Gaudio won the title, defeating Verdasco 2–6, 6–2, 6–4, 6–4 in the final.

Seeds
All seeds received a bye into the second round. • # 🇷🇺 Nikolay Davydenko (second round)

• # 🇦🇷 Mariano Puerta (third round)

• # 🇦🇷 Gastón Gaudio (champion)

• # Fernando González (third round)

• # 🇪🇸 Feliciano López (quarterfinals)

• # 🇷🇺 Mikhail Youzhny (quarterfinals)

• # Nicolás Massú (semifinals)

• # 🇧🇪 Olivier Rochus (second round)

• # 🇦🇹 Jürgen Melzer (third round)

• # 🇷🇴 Andrei Pavel (third round, retired due to heat exhaustion)

• # 🇦🇷 José Acasuso (second round)

• # 🇧🇪 Christophe Rochus (second round, retired due to cramps)

• # 🇷🇺 Igor Andreev (second round)

• # 🇵🇪 Luis Horna (second round)

• # 🇷🇴 Victor Hănescu (quarterfinals)

• # 🇫🇷 Paul-Henri Mathieu (second round, retired due to gastritis)