Since the ATP computerized ranking was introduced in 1973, 100 players have spent at least one week inside the ATP Top 100. The all-time leader is Roger Federer with 1167 weeks, a margin 10% ahead of Novak Djokovic (1064 weeks) and Rafael Nadal (1029 weeks). 100 players have accumulated 52 or more weeks inside the Top 100, with an average of 710 weeks across all ranked players.