| Tournament | Singles
champion |
|---|
| Exxon Mobil Open, Doha, Qatar | Nicolas Escude |
| Kroger St. Jude, Memphis, Tenn. | Joachim Johansson |
| ABN AMRO World Tennis, Rotterdam, Netherlands | Lleyton Hewitt |
| Open 13, Marseille, France | Dominik Hrbaty |
| Dubai Duty Free, Dubai, UAE | Roger Federer |
| Abierto Mexicano Telefonica Movistar, Acapulco, Mexico | Carlos Moya |
| Pacific Life Open Indian Wells, Calif. | Roger Federer |
| NASDAQ-100 Open, Miami, Fla. | Andy Roddick |
| Open de la Communidad Valenciana, Valencia, Spain | Fernando Verdasco |
| Estoril Open, Estoril, Portugal | Juan Ignacio Chela |
| Tennis Masters, Monte Carlo, Monaco | Guillermo Coria |
| Open Seat Godo 2004, Barcelona, Spain | Tommy Robredo |
| Telecom Italia Masters, Rome, Italy | Carlos Moya |
| Masters Series, Hamburg, Germany | Roger Federer |
| Gerry Weber Open, Halle, Germany | Roger Federer |
| Stella Artois, London, England | Andy Roddick |
| Allianz Suisse Open, Gstaad, Switzerland | Roger Federer |
| Mercedes Cup, Stuttgart, Germany | Guillermo Canas |
| RCA Championships, Indianapolis, Ind. | Andy Roddick |
| Generali Open, Kitzbuhel, Austria | Nicolas Massu |
| Tennis Masters, Toronto, Canada | Roger Federer |
| Western & Southern Financial Group Masters, Cincinnati, Ohio | Andre Agassi |
| Legg Mason Tennis Classic, Washington, DC | Lleyton Hewitt |
| China Open, Beijing, China | Marat Safin |
