Since the ATP computerized ranking was introduced in 1973, 100 players have spent at least one week inside the ATP Top 10. The all-time leader is Roger Federer with 968 weeks, a margin 3% ahead of Novak Djokovic (939 weeks) and Rafael Nadal (912 weeks). 100 players have accumulated 52 or more weeks inside the Top 10, with an average of 247 weeks across all ranked players.