As of 14th June 2012, the current world NO1 tennis player Novak Djokovic has not completed the career grand slam yet although he has won 5 grand slam single titles.

Djokovic has won Australia Open three times: 2008, 2011 and 2012, and 2011 Wimbledon and 2011 US Open. So among the four major tennis championships, he only needs to win the French Open to complete the career grand slam. Both Rafael Nadal and Rodger Federer have completed the career grand slam.