2003 Heineken Open – Singles

Greg Rusedski was the defending champion of the singles event of the Heineken Open tennis tournament, held in Auckland, New Zealand, but did not compete that year.

Fourth-seeded Gustavo Kuerten won in the final 6–3, 7–5 against unseeded Dominik Hrbatý.

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


 * 1) 🇨🇿 Jiří Novák (quarterfinals)
 * 2) 🇦🇷 David Nalbandian (first round)
 * 3)  Fernando González (second round)
 * 4) 🇧🇷 Gustavo Kuerten (champion)
 * 5) 🇦🇷 José Acasuso (first round)
 * 6) 🇺🇸 Jan-Michael Gambill (second round)
 * 7) 🇦🇷 Guillermo Coria (quarterfinals)
 * 8) 🇮🇹 Davide Sanguinetti (first round)