Spain's Rafael Nadal plays a return to Philipp Kohlschreiber of Germany during their match of the Monte Carlo Tennis Masters tournament in Monaco, Thursday, April 18, 2013. (AP Photo/Lionel Cironneau)

Associated Press
Spain's Rafael Nadal plays a return to Philipp Kohlschreiber of Germany during their match of the Monte Carlo Tennis Masters tournament in Monaco, Thursday, April 18, 2013. (AP Photo/Lionel Cironneau)
Spain's Rafael Nadal plays a return to Philipp Kohlschreiber of Germany during their match of the Monte Carlo Tennis Masters tournament in Monaco, Thursday, April 18, 2013. (AP Photo/Lionel Cironneau)
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