Serbia’s Novak Djokovic returns the ball to Argentina’s Juan Martin …

Photo by Associated Press | published: September 7, 2012

Serbia’s Novak Djokovic returns the ball to Argentina’s Juan Martin del Potro during their quarterfinal match at the U.S. Open on Thursday in Flushing Meadows, N.Y. Djokovic finished off del Potro, 3-0.