Novak Djokovic speaks to CNN 's World Sport . The Serbian tennis star is the first man in history to win four Wimbledon singles titles and a record eight Grand Slam titles. He has won three of the four Grand Slams this year . In total he has won 10 tournaments , playing 66 matches . He describes 2011 as the `` best year of my career ''
Novak Djokovic speaks to CNN 's World Sport . The Serbian tennis star is the first man in history to win four Wimbledon singles titles and a record eight Grand Slam titles. He has won three of the four Grand Slams this year . He describes 2011 as the `` best year of my career ''