Spain's Rafael Nadal takes part in a training session prior to his participation in the Mexican Open Tennis Tournament held in Acapulco, State of Guerrero, Mexico, on Feb. 25, 2013. (Xinhua/Bao Feifei)

Spain's Rafael Nadal takes part in a training session prior to his participation in the Mexican Open Tennis Tournament held in Acapulco, State of Guerrero, Mexico, on Feb. 25, 2013. (Xinhua/Bao Feifei)

Spain's Rafael Nadal (R) greets fans during a training session prior his participation in the Mexican Open Tennis Tournament held in Acapulco, State of Guerrero, Mexico, on Feb. 25, 2013. (Xinhua/Bao Feifei)

Mexico's Daniel Garza reacts during the men's singles match against Martin Alund of Argentina at the Mexican Open Tennis Tournament held in Acapulco, State of Guerrero, Mexico, on Feb. 25, 2013. (Xinhua/Bao Feifei)

Spain's Rafael Nadal takes part in a training session prior to his participation in the Mexican Open Tennis Tournament held in Acapulco, State of Guerrero, Mexico, on Feb. 25, 2013. (Xinhua/Bao Feifei)

Serbia's Dusan Lajovic returns the ball to Pablo Andujar of Spain during their men's singles match at the Mexican Open Tennis Tournament held in Acapulco, state of Guerrero, Mexico, on Feb. 25, 2013. (Xinhua/Pedro Mera)

Spain's Rafael Nadal takes part in a training session prior to his participation to the Mexican Open Tennis Tournament held in Acapulco, State of Guerrero, Mexico, on Feb. 25, 2013. (Xinhua/Pedro Mera)

Spain's Rafael Nadal (front R) greets fans during a training session prior to his participation in the Mexican Open Tennis Tournament held in Acapulco, State of Guerrero, Mexico, on Feb. 25, 2013. (Xinhua/Bao Feifei)

Spain's Rafael Nadal takes part in a training session prior to his participation in the Mexican Open Tennis Tournament held in Acapulco, State of Guerrero, Mexico, on Feb. 25, 2013. (Xinhua/Bao Feifei)