The 2011 Western & Southern Open, also known as the Cincinnati Open, was a tennis tournament played on outdoor hard courts at the Lindner Family Tennis Center in Mason, Ohio, United States. The tournament was a joint men's and women's event, with six new courts being built for the tournament. The competition took place from August 15 through August 21, 2011. The 110th edition of the Cincinnati Open, it was a Masters 1000 event on the 2011 ATP World Tour, and part of the Premier Series of the 2011 WTA Tour.

Sir Andrew Barron Murray is a British professional tennis player. He was ranked world No. 1 in singles by the Association of Tennis Professionals (ATP) for 41 weeks, and finished as the year-end No. 1 in 2016. Murray has won three Grand Slam singles titles, two at Wimbledon and one at the US Open, and has reached eleven major finals. Murray was ranked in the top 10 for all but one month from July 2008 through to October 2017, and was no lower than world No. 4 in eight of the nine year-end rankings during that span. Murray has won 46 ATP Tour singles titles, including 14 Masters 1000 events and two gold medals at the Summer Olympics.