Andy Murray won the men's singles title at the 2011 Cincinnati Masters after Novak Djokovic retired from the final, with the scoreline at 6–4, 3–0. It was Murray's seventh Masters title. Djokovic's retirement in the final marked only his second defeat of the season. Roger Federer was the two-time defending champion, but lost to Tomáš Berdych in the quarterfinals. Seeds The top eight seeds receive a bye into the second round. Qualifying Main draw Finals Top half Section 1 Section 2 Bottom half Section 3 Section 4 References Main draw Western and Southern Open 2011 Western & Southern Open