Since the ATP computerized ranking was introduced in 1973, 100 players have spent at least one week inside the ATP Top 30. The all-time leader is Roger Federer with 1097 weeks, a margin 9% ahead of Novak Djokovic (1009 weeks) and Andre Agassi (932 weeks). 100 players have accumulated 52 or more weeks inside the Top 30, with an average of 473 weeks across all ranked players.