Agassi–Sampras rivalry the 1990 US Open, with Agassi the favorite because of his top-three ranking even though Sampras had defeated former World No. 1 players Ivan Lendl and John McEnroe on the way to the final. Sampras defeated Agassi in straight sets. The next time the pair met at a Grand Slam final was at the 1995 Australian Open. Agassi beat Sampras in four sets. In one of their matches, played in the 2001 US Open quarter-final, Sampras won with the score of 6–7(7), 7–6(2), 7–6(2), 7–6(5); throughout the match, no player managed to break the other's serve. The last match in
Doping in tennis and International Tennis Federation (ITF) led a combined anti-doping initiative in professional tennis. Following the joint initiative between the ATP and WTA, the International Tennis Federation (ITF) became the sole governing body for professional tennis anti-doping initiatives in 2007, as the Association of Tennis Professionals (ATP World Tour) and Women's Tennis Association (WTA World Tour) moved towards a player-focused organisation and administrative role. Other bodies that regulate doping within tennis on a national level include the United States Anti-Doping Agency. In 1997, Andre Agassi returned a positive drug test for the use of methamphetamine. A joint investigation carried out by