The 1991 Cincinnati Open, known by the corporate title of the Thriftway ATP Championships was a tennis tournament played on outdoor clay courts. It was the 90th edition of the tournament and was part of the ATP Super 9 of the 1991 ATP Tour It took place in Mason, Ohio, United States, from August 5 through August 11, 1991.[1]
The tournament had previously appeared on the Tier III of the WTA Tour but no event was held from 1989 to 2003.
See main article: 1991 Thriftway ATP Championships – Singles. Guy Forget defeated Pete Sampras, 2–6, 7–6(7–4), 6–4
See main article: 1991 Thriftway ATP Championships – Doubles. Ken Flach / Robert Seguso defeated Grant Connell / Glenn Michibata 6–7, 6–4, 7–5