Since the ATP computerized ranking was introduced in 1973, 43 players have spent at least one week inside the ATP Top 2. The all-time leader is Novak Djokovic with 599 weeks, a margin 1% ahead of Rafael Nadal (596 weeks) and Roger Federer (528 weeks). 23 players have accumulated 52 or more weeks inside the Top 2, with an average of 127 weeks across all ranked players.