2003 ABN AMRO World Tennis Tournament – Singles

Nicolas Escudé was the defending champion but lost in the quarterfinals against Sébastien Grosjean.

Max Mirnyi won in the final 7–6(7–3), 6–4 against Raemon Sluiter.

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


 * 1) 🇪🇸 Juan Carlos Ferrero (quarterfinals, retired because of a sprained ankle)
 * 2)  Roger Federer (semifinals)
 * 3) 🇷🇺 Marat Safin (second round)
 * 4) 🇪🇸 Albert Costa (first round)
 * 5) 🇬🇧 Tim Henman (first round)
 * 6) 🇫🇷 Sébastien Grosjean (semifinals)
 * 7) 🇪🇸 Àlex Corretja (first round)
 * 8)  Sjeng Schalken (quarterfinals)