Since the ATP computerized ranking was introduced in 1973, 87 players have spent at least one week inside the ATP Top 4. The all-time leader is Novak Djokovic with 825 weeks, a margin 3% ahead of Roger Federer (804 weeks) and Rafael Nadal (756 weeks). 40 players have accumulated 52 or more weeks inside the Top 4, with an average of 125 weeks across all ranked players.