The two top ranked players in the world, Novak Djokovic and Andy Murray, suffered upset losses Friday, exiting the Cincinnati Masters at the quarter-final stage.
Novak Djokovic of Serbia returns a shot to John Isner in their men's singles quarter-final match on August 16, 2013 at Lindner Family Tennis Center in Cincinnati, Ohio. Djokovic fell 7-6 (7/5), 3-6, 7-5.
The elite pair of five-time champion Roger Federer and Rafael Nadal were meeting later in a blockbuster quarter-final.
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