1998 Great American Insurance ATP Championships
| 1998 Great American Insurance ATP Championships | |
|---|---|
| Date | August 10 – August 17 |
| Edition | 97th |
| Category | ATP Super 9 |
| Surface | Clay / Outdoor |
| Location | Cincinnati, United States |
| Venue | Lindner Family Tennis Center |
| Champions | |
| Singles | |
 Patrick Rafter
|
|
| Doubles | |
 Mark Knowles /  Daniel Nestor
|
|
The 1998 Cincinnati Open, known by the corporate title of the Great American Insurance ATP Championships was a tennis tournament played on outdoor clay courts. It was the 95th edition of the tournament previously known as the Thriftway ATP Championships, and was part of the ATP Super 9 of the 1998 ATP Tour. It took place in Cincinnati, United States, from August 10 through August 17, 1998.
The tournament had previously appeared on the Tier III of the WTA Tour but no event was held from 1989 to 2003.
Patrick Rafter def. 
Pete Sampras, 1–6, 7–6(7–2), 6–4.
Mark Knowles / Daniel Nestor def. 
Olivier Delaître / Fabrice Santoro, 6–1, 2–1, ret.
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