Spain's Rafael Nadal dries off during his practice session 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 dries off during his practice session 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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