1990 ATP Tour
The 1990 IBM ATP Tour was the first season of the ATP Tour, the newly formed single world tennis circuit which came in replacing the two dual tours the Grand Prix [tennis circuit|ITF Grand Prix Circuit] and WCT Circuit. 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, Davis Cup and Grand Slam Cup are included in this calendar but did not count towards the Tour.
Schedule
This is the complete schedule of events on the 1990 IBM ATP Tour, with player progression documented from the quarterfinals stage.;Key
| Grand Slam |
| ATP Tour World Championships |
| ATP Championship Series, Single-Week |
| ATP Championship Series |
| ATP World Series |
| Team Events |
August
December
| Week | Tournament | Champions | Runners-up | Semifinalists | Quarterfinalists |
| 10 Dec | Compaq Grand Slam Cup Munich, Germany Grand Slam Cup Carpet – $6,000,000 – 16S Singles |  Statistical informationList of players and titles won, alphabetically by last name:
|