See main article: 2011 Erste Bank Open.
Jürgen Melzer was the two-time defending champion, but lost to Kevin Anderson in the quarterfinals.
No.1 seed Jo-Wilfried Tsonga won the tournament beating No. 2 seed Juan Martín del Potro in the final, 6–7(5–7), 6–3, 6–4.
The top four seeds receive a bye into the second round.
See main article: 2011 Erste Bank Open – Singles qualifying.