Somdev Devvarman of India returns the ball to Juan Martin Del Potro of Argentina during the second round of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Tuesday, Feb. 25, 2014. (AP Photo/Kamran Jebreili)

Mideast Emirates Dubai Tennis Championships

Somdev Devvarman of India returns the ball to Juan Martin Del Potro of Argentina during the second round of the Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Tuesday, Feb. 25, 2014. (AP Photo/Kamran Jebreili)

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