2011 Medibank International Sydney – Men's singles

Marcos Baghdatis was the defending champion after defeating Richard Gasquet in the 2010 final but had to withdraw from the tournament in 2011.

Gilles Simon won the championships by beating 4th seed Viktor Troicki 7–5, 7–6(7–4) in the final.

Seeds
The top four seeds receive a bye to the second round. • # 🇺🇸 Sam Querrey (second round)

• # 🇨🇾 Marcos Baghdatis (withdrew due to a groin injury)

• # Ernests Gulbis (semifinals)

• # 🇷🇸 Viktor Troicki (final)

• # 🇫🇷 Richard Gasquet (quarterfinals)

• # 🇪🇸 Feliciano López (first round)

• # 🇪🇸 Guillermo García López (second round)

• # Lu Yen-hsun (first round)