2004 ABN AMRO World Tennis Tournament – Singles

Max Mirnyi was the defending champion but lost in the semifinals to Juan Carlos Ferrero.

Lleyton Hewitt won in the final 6–7(1–7), 7–5, 6–4 against Ferrero.

Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.


 * 1)  Roger Federer (quarterfinals)
 * 2) 🇪🇸 Juan Carlos Ferrero (final)
 * 3) 🇩🇪 Rainer Schüttler (quarterfinals)
 * 4) 🇹🇭 Paradorn Srichaphan (first round)
 * 5) 🇬🇧 Tim Henman (semifinals)
 * 6) 🇦🇺 Lleyton Hewitt (champion)
 * 7)  Sjeng Schalken (second round)
 * 8)  Martin Verkerk (first round)