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2012 US Open - Day 3

NEW YORK, NY - AUGUST 29: Kim Clijsters of Belgium reacts against Laura Robson of Great Britain during their women's singles second round match Day Three of the 2012 US Open at USTA Billie Jean King National Tennis Center on August 29, 2012 in the Flushing neigborhood of the Queens borough of New York City. (Photo by Michael Heiman/Getty Images)

Kim Clijsters loses final singles match

Four-time Grand Slam champion Kim Clijsters lost in straight sets to Laura Robson

of Britain in the second round of the U.S. Open on Wednesday, Aug. 29 and will

head into retirement after she finishes playing in doubles at Flushing