| Singles | |
|---|---|
| 2003 Heineken Open | |
| Champion |
|
| Runner-up |
|
| Final score | 6–3, 7–5 |
| Draw | 32 (4Q / 3WC) |
| Seeds | 8 |
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.
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.