Juan Martin Del Potro of Argentina reacts after he lost a point against 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 reacts after he lost a point against 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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