| 2004 Western & Southern Financial Group Masters and Western & Southern Financial Group Women's Open | |
|---|---|
| Date | 2–8 August (men) 16–22 August (women) |
| Edition | 103rd |
| Surface | Hard / Outdoor |
| Location | Mason, United States |
| Venue | Lindner Family Tennis Center |
| Champions | |
| Men's singles | |
 Andre Agassi | |
| Women's singles | |
| Lindsay Davenport | |
| Men's doubles | |
 Mark Knowles / Daniel Nestor | |
| Women's doubles | |
| Jill Craybas /Marlene Weingärtner | |
The2004 Cincinnati Masters (also known as theWestern & Southern Financial Group Masters andWestern & Southern Financial Group Women's Open for sponsorship reasons) was atennis tournament played onoutdoor hard courts. It was the 103rd edition of theCincinnati Masters, and was part of theATP Masters Series of the2004 ATP Tour, and of theTier III Series of the2004 WTA Tour. Both the men's and the women's events took place at theLindner Family Tennis Center inMason, nearCincinnati,Ohio, United States. It was the first Cincinnati event to feature both men and women's draws since 1989.
Andre Agassi defeated
Lleyton Hewitt, 6–3, 3–6, 6–2
Lindsay Davenport defeated
Vera Zvonareva 6–3, 6–2
Mark Knowles /Daniel Nestor defeated
Jonas Björkman /Todd Woodbridge, 6–2, 3–6, 6–3
Jill Craybas /
Marlene Weingärtner defeated
Emmanuelle Gagliardi /Anna-Lena Grönefeld 7-5, 7-6(7–2)