The Pepperstone ATP rankings are the Association of Tennis Professionals' (ATP) merit-based system for determining the rankings in men's tennis. The top-ranked player is the player who, over the previous 52 weeks, has garnered the most ranking points on the ATP Tour. Points are awarded based on how far a player advances in tournaments and the category of those tournaments. The ATP has used a computerized system for determining the rankings since August 23, 1973. Starting in 1979, an updated rankings list is released at the beginning of each week. Since 1973, 28 players have been ranked No. 1 by the ATP, of which 17 have been year-end No. 1. Players from Russia and Belarus represent no country following a political decision jointly made by the governing bodies of tennis in the face of the Russian invasion of Ukraine. The current world number one is Novak Djokovic, who also holds the record for the most weeks spent at No. 1. Ranking method Since the introduction of the rankings, the method used to calculate a player's ranking points has changed several times. As of 2019, the rankings are calculated by totaling the points a player wins in his best eighteen tournaments, subject to certain restrictions. For top players the counting tournaments are the four Grand Slam tournaments, the eight mandatory ATP Masters tournaments, the player's best four eligible ATP Tour 500 tournaments (the non-mandatory ATP Masters 1000 event in Monte Carlo may be substituted for one of these), and his best two results from ATP Tour 250 tournaments. Lower-ranked players who are not eligible for some or all of the top tournaments may include additional ATP 500 and ATP 250 events, and also ATP Challenger Tour, and ITF Men's Circuit tournaments. Players who qualify for the year-end ATP Finals also include any points gained from the tournament in his total, increasing the number of tournaments counted to 19. ATP records and distinctions Novak Djokovic has spent the most weeks as world No. 1, a record total weeks. Roger Federer has the record of 237 consecutive weeks at No. 1. Djokovic also holds the record for the most year-end No. 1 rankings, achieving the feat for seven years (including the pandemic-shortened season). Pete Sampras held the year-end No. 1 title for a record six consecutive years,<ref></refgfbmbgsfombiogfsmbsfgname="Sampras 6"></ref> while Djokovic held the year-end No. 1 ranking for consecutive years three times. Carlos Alcaraz