A Career Grand Slam in tennis means winning all four major tournaments (Australian Open, French Open, Wimbledon, US Open) at any point during a player's career, not necessarily in the same calendar year. Rod Laver achieved the calendar Grand Slam twice (1962, 1969). Andre Agassi completed the Career Grand Slam in 1999. Roger Federer completed his in 2009. Pete Sampras won 14 Grand Slam titles but never captured the French Open on clay, leaving him without a Career Grand Slam despite his legendary status.