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David Ferrer of Spain plays a forehand during the men's singles round one match against Jarkko Nieminen of Finland. (Getty Images)

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Renata Voracova of Czech Republic serves during the women's singles round one match Alize Cornet of France. (Getty Images)

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Samantha Stosur of Australia plays a backhand during the women's singles round one match against Iveta Benesova of Czech Republic. (Getty Images)

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Caroline Wozniacki of Denmark plays a forehand during the women's singles round one match against Kimiko Date-Krumm of Japan. (Getty Images)

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Novak Djokovic of Serbia stretches to hit a forehand during the men's singles first round match against Thiemo De Bakker of Netherlands. (Getty Images)