David Ferrer

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Spain's David Ferrer serves to South Africa's Kevin Anderson at the Mexican Tennis Open in Acapulco, Mexico, Thursday, Feb. 27, 2014. (AP Photo/Hugo Avila, JAM MEDIA)

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South Africa's Kevin Anderson returns the ball to Spain's David Ferrer at the Mexican Tennis Open in Acapulco, Mexico, Thursday Feb. 27, 2014. (AP Photo/Hugo Avila, JAM MEDIA)

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Spain's David Ferrer is treated after injuring his right leg while playing South Africa's Kevin Anderson at the Mexican Tennis Open in Acapulco, Mexico, Thursday, Feb. 27, 2014. Ferrer retired from the match and Anderson won the match. (AP Photo/Hugo Avila, JAM MEDIA)

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Spain's Feliciano Lopez prepares to return the ball to Spain's David Ferrer at the Mexican Tennis Open in Acapulco, Mexico, Wednesday, Feb. 26, 2014. (AP Photo/Jam Media, Hugo Avila)

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Spain's David Ferrer returns the ball to Spain's Feliciano Lopez at the Mexican Tennis Open in Acapulco, Mexico, Wednesday Feb. 26, 2014. (AP Photo/Jam Media, Hugo Avila)

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Spain's David Ferrer returns the ball to Russia's Mikhail Kukushkin during a match at the Mexican Tennis Open in Acapulco, Mexico, Tuesday, Feb. 25, 2014. (AP Photo/Jam Media, Hugo Avila)

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Alexandr Dolgopolovof Ukraine returns the ball to David Ferrer of Spain at the Rio Open tennis tournament in Rio de Janeiro, Brazil, Saturday, Feb. 22, 2014. (AP Photo/Leo Correa)

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David Ferrer of Spain returns the ball to Alexandr Dolgopolov of the Ukraine at the Rio Open tennis tournament in Rio de Janeiro, Brazil, Saturday, Feb. 22, 2014. (AP Photo/Leo Correa)

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David Ferrer of Spain returns the ball to Jeremy Chardy of France at the Rio Open tennis tournament in Rio de Janeiro, Brazil, Tuesday, Feb. 18, 2014. (AP Photo/Silvia Izquierdo)