Spain's Rafael Nadal bites his trophy after defeating Ukraine's Alexandr Dolgopolov at 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. (AP Photo/Silvia Izquierdo)

Brazil Rio Open Tennis

Spain's Rafael Nadal bites his trophy after defeating Ukraine's Alexandr Dolgopolov at 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. (AP Photo/Silvia Izquierdo)

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