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The 2008 US Open runner-up Andy Murray needed almost four hours to clinch a 7-6 (7/5), 7-6 (7/5), 4-6, 7-6 (7/4) victory over Spain's Feliciano Lopez. (Getty Images)
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The former French Open champion Ana Ivanovic defeated USA's Sloane Stephens 6-7, 6-4, 6-2 in two hours and 21 minutes to advance to the round of 16. (Getty Images)
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Angelique Kerber of Germany returns a shot against Olga Govortsova of Belarus. (Getty Images)
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Feliciano Lopez exults after scoring a point against Andy Murray. (Getty Images)
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Kei Nishikori of Japan plays a backhand against Croatia's Marin Cilic. (Getty Images)
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Mardy Fish serves in his third round match against Gilles Simon of France. (Getty Images)
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Russia's Maria Kirilenko prepares for a serve against Andrea Hlavackova of the Czech Republic. (Getty Images)
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Olga Govortsova of Belarus in action against Angelique Kerber of Germany. (Getty Images)
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Top seed Roger Federer defeated
Fernando Verdasco 6-3, 6-4, 6-4 to make the last 16. (Getty Images)
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Serena Williams signs her autograph for fans after defeating Ekaterina Makarova of Russia. (Getty Images)
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Sloane Stephens plays a backhand in her women's third round match against Ana Ivanovic. (Getty Images)
