1990 Thriftway ATP Championships – Singles
The singles competition of the 1990 Cincinnati Open (known as the Thriftway ATP Championships for sponsorship reasons) was a tennis tournament played on outdoor hard courts. It was the 91st edition of the tournament and was part of the 1990 ATP Tour. It took place in Cincinnati, Ohio, United States from August 6 through August 12, 1990. Brad Gilbert was the defending champion but Stefan Edberg defeated him 6–1, 6–1 in the final. Seeds. The top eight seeds received a bye to the second round.