Rafael Nadal of Spain is seen using medical patch on his back during his game against Alexandr Dolgopolov of Ukraine at the Rio Open tennis tournament in Rio de Janeiro, Brazil, Sunday, Feb.23, 2014. Rafael Nadal returned from a troublesome back injury to win the Rio Open on Sunday, defeating Alexandr Dolgopolov 6-3, 7-6. (AP Photo/Silvia Izquierdo)

Brazil Rio Open Tennis

Rafael Nadal of Spain is seen using medical patch on his back during his game against Alexandr Dolgopolov of Ukraine at the Rio Open tennis tournament in Rio de Janeiro, Brazil, Sunday, Feb.23, 2014. Rafael Nadal returned from a troublesome back injury to win the Rio Open on Sunday, defeating Alexandr Dolgopolov 6-3, 7-6. (AP Photo/Silvia Izquierdo)

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