Claim: Andre Agassi was the number 1 tennis player in the world at one point.

The ATP Rankings are the Association of Tennis Professionals ' -LRB- ATP -RRB- merit-based method 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 ATP ranking points . 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 23 August 1973 . Starting in 1979 , an updated rankings list is released at the beginning of each week .   Since 1973 , 26 men have been ranked number 1 by the ATP , of which 17 have been year-end number 1 . The current world number one is Andy Murray .