1990 Thriftway ATP Championship

The 1990 Thriftway ATP Championship, also known as the Cincinnati Open, was a tennis tournament played on outdoor hard courts. It was the 89th edition of the tournament and was part of the ATP Championship Series, Single Week category of the 1990 ATP Tour. It took place in Mason, Ohio, United States from August 6 through August 12, 1990.
The tournament had previously appeared on the Tier III Series of the WTA Tour but no event was held from 1989 to 2003.