In tennis, the first edition of the US Open Series was contested in 2004.
| Week | Date | Men's Events | Women's Events |
|---|
| 1 | July 12 – July 18 | Los Angeles
Mercedes Benz Cup
2004 Champion: {{flagicon|GER}} Tommy Haas | Stanford
Bank of the West Classic
2004 Champion: {{flagicon|USA}} Lindsay Davenport |
| 2 | July 19 – July 25 | Indianapolis
RCA Championships
2004 Champion: {{flagicon|USA}} Andy Roddick | Los Angeles
JPMorgan Chase Open
2004 Champion: {{flagicon|USA}} Lindsay Davenport |
| 3 | July 26 – August 1 | Toronto
Canada Masters
2004 Champion: {{flagicon|SUI}} Roger Federer | San Diego
Acura Classic
2004 Champion: {{flagicon|USA}} Lindsay Davenport |
| 4 | August 2 – August 8 | Cincinnati
Cincinnati Masters
2004 Champion: {{flagicon|USA}} Andre Agassi | Montreal
Rogers AT&T Cup
2004 Champion: {{flagicon|FRA}} Amélie Mauresmo |
| 5 | August 9 – August 15 | No series event held this week |
| 6 | August 16 – August 22 | Washington, D. C.
Legg Mason Tennis Classic
2004 Champion: {{flagicon|AUS}} Lleyton Hewitt | No series event held this week |
| 7 | August 23 – August 29 | No series event held this week | New Haven
Pilot Pen Tennis
2004 Champion: {{flagicon|RUS}} Elena Bovina |
| 8 | August 30 – September 6 | New York
US Open
2004 Champion: {{flagicon|SUI}} Roger Federer | New York
US Open
2004 Champion: {{flagicon|RUS}} Svetlana Kuznetsova |
1. ^{{Cite web|url=http://www.usopenseries.com/About-Us/about_the_us_open_series_/?intloc=headernav|title=ABOUT THE US OPEN SERIES|last=United States Tennis Association|first=|date=|website=US Open Series|archive-url=|archive-date=|dead-url=|access-date=}}
{{US Open Series by year}}