Djokovic gets past del Potro to reach Open semis

AP - Sports
Djokovic gets past del Potro to reach Open semis
Roger Federer, of Switzerland, wipes his brow late in the fourth set during his loss to Tomas Berdych, of the Czech Republic, in the quarterfinal round of play at the U.S. Open tennis tournament, Wednesday, Sept. 5, 2012, in New York. Berdych won 7-6 (1), 6-4, 3-6, 6-3. (AP Photo/Charles Krupa)
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