Since the ATP computerized ranking was introduced in 1973, 100 players have spent at least one week inside the ATP Top 6. The all-time leader is Roger Federer with 897 weeks, followed by Novak Djokovic (893 weeks) and Rafael Nadal (867 weeks). 71 players have accumulated 52 or more weeks inside the Top 6, with an average of 162 weeks across all ranked players.