US Open 2011: Novak Djokovic targeting career slam

Newly crowned US Open Champion Novak Djokovic says he still has a lot to prove despite clinching his third Grand Slam title of the year by beating Rafael Nadal 6-2 6-4 6-7 (3-7) 6-1 in New York.

The world number one added the US title to his Australian Open and Wimbledon crowns and now wants the French Open title to complete the full set of Grand Slams.