Novak Djokovic, right, of Serbia holds the winners ATP World Tour tennis trophy as he stand next to runner-up Roger Federer of Switzerland as they pose for the photographers following their singles final match in London, Monday, Nov. 12, 2012. (AP Photo/Sang Tan)

Associated Press
Novak Djokovic, right, of Serbia holds the winners ATP World Tour tennis trophy as he stand next to runner-up Roger Federer of Switzerland as they pose for the photographers following their singles final match in London, Monday, Nov. 12, 2012. (AP Photo/Sang Tan)
Novak Djokovic, right, of Serbia holds the winners ATP World Tour tennis trophy as he stand next to runner-up Roger Federer of Switzerland as they pose for the photographers following their singles final match in London, Monday, Nov. 12, 2012. (AP Photo/Sang Tan)
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