Novak Djokovic is a Serbian professional tennis player who is currently ranked world No. 1 in singles by the Association of Tennis Professionals (ATP). Djokovic has been ranked No. 1 for a record total of 422 weeks in a record 13 different years, and finished as the year-end No. 1 a record eight times. Djokovic has won a record 24 Grand Slam men's singles titles, including a record ten Australian Open titles. Overall, he has won 98 singles titles, including a record 71 Big Titles: 24 majors, a record 40 Masters, and a record seven ATP Finals. Djokovic is the only man in tennis history to be the reigning champion of all four majors at once across three different surfaces. In singles, he is the only man to achieve a triple Career Grand Slam, and the only player to complete a career Golden Masters, a feat he has achieved twice.