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The 1990 IBM ATP Tour was the first season of the ATP Tour, the newly formed tennis circuit which came in to replace the Grand Prix and WCT tournaments. It was the elite tour for professional tennis organized by the Association of Tennis Professionals. In 1990 the IBM ATP Tour included the four Grand Slam tournaments, the ATP Tour World Championships, the ATP Championship Series, Single-Week, the ATP Championship Series and the ATP World Series. The World Team Cup and Davis Cup are included in this calendar but did not count towards the Tour.