4 – Novak Djokovic
Novak Djokovic is a Serbian professional tennis player who is currently ranked world No. 1 by the Association of Tennis Professionals (ATP). He has been ranked world No. 1 for a record total of 367 weeks, and has finished as the year-end No.1 a record seven times. He has won 20 Grand Slam men’s singles titles, including a record nine Australian Open titles.