Andre Kirk Agassi is an American retired professional tennis player and former World No. 1, who was one of the game's most dominant players from the early 1990s to the mid-2000s. Generally considered by critics and fellow players to be one of the greatest tennis players of all time, Agassi has been called the best service returner in the history of the game. Described by the BBC upon his retirement as "perhaps the biggest worldwide star in the sport's history", Agassi compiled performances that, along with his unorthodox apparel and attitude, saw him cited as one of the most charismatic players in the history of the game. As a result, he is credited for helping to revive the popularity of tennis during the 1990s.
In singles tennis, Agassi is an eight-time Grand Slam champion and a 1996 Olympic gold medalist, as well as finishing runner-up in seven other Grand Slam tournaments. His four Australian Open titles are an Open Era record. He is one of four male singles players to achieve the Career Grand Slam in the Open Era and one of seven in history, the first of two to achieve the Career Golden Slam, and the only man to win the Career Golden Slam and the ATP Tour World Championships: a distinction dubbed as a "Career Super Slam" by Sports Illustrated.