Rafael Nadal of Spain returns the ball to Alexandr Dolgopolov,  of Ukraine, during the final of the Rio Open tennis tournament in Rio de Janeiro, Brazil, Sunday Feb. 23, 2014.  Nadal returned from a troublesome back injury to win the Rio Open on Sunday. (AP Photo/Silvia Izquierdo)

Brazil Rio Open Tennis

Rafael Nadal of Spain returns the ball to Alexandr Dolgopolov, of Ukraine, during the final of the Rio Open tennis tournament in Rio de Janeiro, Brazil, Sunday Feb. 23, 2014. Nadal returned from a troublesome back injury to win the Rio Open on Sunday. (AP Photo/Silvia Izquierdo)

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