Novak Djokovic doesn't realize he broke a string during his semifinal against Kei Nishikori in Rome.

Andy Roddick imitates Serena Williams during an exhibition night in Toronto. Serena Williams herself, Milos Raonic and Agnieszka Radwanska also took part to this event. (2012-11-16)

Andy Roddick imitates Rafael Nadal during an exhibition night in Toronto. Milos Raonic, Serena Williams and Agnieszka Radwanska also took part of this event. (2012-11-16)