2003 Tennis Masters Series Singles Singles

| Tournament | Surface | Week | Winner | Finalist | Semifinalists |
|---|---|---|---|---|---|
| Indian Wells | Hard | March 10 | Lleyton Hewitt (1) 6–1, 6–1 | Gustavo Kuerten | Vincent Spadea (Q) Rainer Schüttler (15) |
| Miami | Hard | March 17 | Andre Agassi (2) 6–3, 6–3 | Carlos Moyá (5) | Paradorn Srichaphan (13) Albert Costa (9) |
| Monte Carlo | Clay | April 14 | Juan Carlos Ferrero (1) 6–2, 6–2 | Guillermo Coria | Vincent Spadea Carlos Moyá (2) |
| Rome | Clay | May 5 | Felix Mantilla 7–5, 6–2, 7–6(8) | Roger Federer (4) | Yevgeny Kafelnikov Juan Carlos Ferrero (2) |
| Hamburg | Clay | May 12 | Guillermo Coria (12) * 6–3, 6–4, 6–4 | Agustín Calleri | David Nalbandian (8) Gastón Gaudio |