Juan Martin Del Potro of Argentina serves the ball to Somdev Devvarman of India 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

Juan Martin Del Potro of Argentina serves the ball to Somdev Devvarman of India 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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