Andre Agassi make it as a pro. Agassi lost the US Open final to Sampras in three sets. The rivalry between these two American players became the dominant rivalry in tennis over the rest of the decade. Agassi ended 1990 on high note as he helped the United States win its first Davis Cup in 8 years and won his only Tennis Masters Cup, beating reigning Wimbledon champion Stefan Edberg in the final. In 1991, Agassi reached his second consecutive French Open final, where he faced fellow Bollettieri Academy alumnus Jim Courier. Courier emerged the victor in a five-set final. Agassi decided
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