Spain's Rafael Nadal leans against the wall as rests during his training for the Rio Open in Rio de Janeiro, Brazil, Friday, Feb. 14, 2014. Top-ranked Nadal injured his back warming up for the final of the Australian Open almost three weeks ago, eventually losing against Stanislas Wawrinka, a match he was an overwhelming favorite to win. Nadal has practiced little since then, getting treatment at home in Mallorca. His first test comes in next week's Rio Open, a new stop on the ATP Tour. (AP Photo/Silvia Izquierdo)

Brazil Rio Open Nadal

Spain's Rafael Nadal leans against the wall as rests during his training for the Rio Open in Rio de Janeiro, Brazil, Friday, Feb. 14, 2014. Top-ranked Nadal injured his back warming up for the final of the Australian Open almost three weeks ago, eventually losing against Stanislas Wawrinka, a match he was an overwhelming favorite to win. Nadal has practiced little since then, getting treatment at home in Mallorca. His first test comes in next week's Rio Open, a new stop on the ATP Tour. (AP Photo/Silvia Izquierdo)

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