Serbia's Novak Djokovic reacts to a call against Spain's Fernando Verdasco during 

Serbia's Novak Djokovic reacts to a call against Spain's Fernando Verdasco during the men's final at the Hopman Cup tennis tournament in Perth, Australia, Saturday Jan. 5, 2013. Djokovic won the match 6-4, 7-5. (AP Photo/Theron Kirkman)
Associated Press
Serbia's Novak Djokovic reacts to a call against Spain's Fernando Verdasco during the men's final at the Hopman Cup tennis tournament in Perth, Australia, Saturday Jan. 5, 2013. Djokovic won the match 6-4, 7-5. (AP Photo/Theron Kirkman)
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