Novak Djoković is a professional Serbian tennis player and is currently World No. 1. Djokovic has won 6 Grand Slam titles; all singles. Novak has won the Australian Open four times (2008, 2011, 2012, 2013) and Wimbledon and the US Open once, both in 2011. Djokovic has been the year-end World No. 1 twice, in 2011 and 2013. Djokovic is also the first male serbian tennis player to win a singles grand slam title.