Andre Agassi quit tennis in 1994.
Andre Kirk Agassi ( [ ˈɑːndreɪ_ˈæɡəsi ] born April 29 , 1970 ) is an American retired professional tennis player and former World No. 1 who was one of the sport 's most dominant players from the early 1990s to the mid-2000s . Agassi returned to World No. 1 in 1999 and enjoyed the most successful run of his career over the next four years . The ATP Rankings are the Association of Tennis Professionals ' ( ATP ) merit-based method for determining the rankings in men 's tennis .