ATP Rankings - additional information
The ATP Rankings is a merit-based method system used to determine the entry and seeding in all singles and doubles tournaments for professional male tennis players. A player’s ranking is based on his performance in 19 official tournaments, including the four Grand Slams and the eight mandatory ATP World Tour Masters 1000 tournaments. The top ranked player is the player who, over the previous 52 weeks, amassed the most ATP ranking points from these tournaments.
Novak Djokovic is at the top of this list having had a very successful year. In the 2014 season he won the Wimbledon Championships for the second time, defeating Roger Federer in the final, and earned over 9 million U.S. dollars, making him the highest earner of the season
Since the inception of the computerized ranking system in 1973, 25 men have been ranked number one by the ATP. Roger Federer (second in the 2014 rankings) holds the records for the most total weeks at number one (302) and the most consecutive weeks at number 1 (237), winning a total of 17 Grand Slam tournaments in the process. Pete Sampras holds the record for the most year-end number one rankings which occurred consecutively between 1993 and 1998. Ivan Lendl and Marcelo Ríos are the only two players to have reached number one status without previously having won a Grand Slam tournament and although Lendl went on to win the 1984 French Open, Ríos remains the only number one player to have never won a Grand Slam singles title, despite having reached the final of the Australian Open in 1998. Lleyton Hewitt was the youngest world number one at 20 years, 268 days and Andre Agassi the oldest at 33 years, 131 days.