# 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.
* Jiří Novák (quarterfinals)
* David Nalbandian (first round)
* Fernando González (second round)
* Gustavo Kuerten (champion)
* José Acasuso (first round)
* Jan-Michael Gambill (second round)
* Guillermo Coria (quarterfinals)
* Davide Sanguinetti (first round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking
| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | J Novák | 6 | 6 | | | | | | | | | | | | | | | | | | | |
| Q | R Kendrick | 2 | 3 | | 1 | J Novák | 1 | 7$^8$ | 6 | | | | | | | | | | | | | |
| | A Calleri | 6$^5$ | 5 | | Q | R Ginepri | 6 | 6$^6$ | 3 | | | | | | | | | | | | | |
| Q | R Ginepri | 7$^7$ | 7 | | | | | | | 1 | J Novák | 7$^7$ | 2 | 6$^3$ | | | | | | | | |
| | A Sá | 7$^9$ | 5 | 4 | | | | | | | F Mantilla | 6$^5$ | 6 | 7$^7$ | | | | | | | | |
| | K Carlsen | 6$^7$ | 7 | 6 | | K Carlsen | 4 | 4 | | | | | | | | | | | | | | |
| | F Mantilla | 6 | 7 | | | F Mantilla | 6 | 6 | | | | | | | | | | | | | | |
| 5 | J Acasuso | 3 | 5 | | | | | | | | | | | | | F Mantilla | 2 | 2 | | | | |
| 3 | F González | 3 | 7$^7$ | 6 | | | | | | | | | | | | D Hrbatý | 6 | 6 | | | | |
| | F López | 6 | 6$^5$ | 2 | 3 | F González | 4 | 3 | | | | | | | | | | | | | | |
| | A Martín | 3 | 2 | | | D Ferrer | 6 | 6 | | | | | | | | | | | | | | |
| | D Ferrer | 6 | 6 | | | | | | | | D Ferrer | 5 | 3 | | | | | | | | | |
| | D Hrbatý | 6 | 6 | | | | | | | | D Hrbatý | 7 | 6 | | | | | | | | | |
| WC | S Rea | 4 | 2 | | | D Hrbatý | 6 | 6$^6$ | 7$^7$ | | | | | | | | | | | | | |
| | M Kratochvil | 1 | 3 | | 6 | J-M Gambill | 3 | 7$^8$ | 6$^4$ | | | | | | | | | | | | | |
| 6 | J-M Gambill | 6 | 6 | | | | | | | | | | | | | | | | | Dominik Hrbatý | 3 | 5 |
| 7 | G Coria | 2 | 6 | 6 | | | | | | | | | | | | | | | 4 | Gustavo Kuerten | 6 | 7 |
| | D Sánchez | 6 | 2 | 4 | 7 | G Coria | 6 | 6 | | | | | | | | | | | | | | |
| WC | L Horna | 6 | 6$^5$ | 2 | | F Vicente | 2 | 2 | | | | | | | | | | | | | | |
| | F Vicente | 3 | 7$^7$ | 6 | | | | | | 7 | G Coria | 5 | 6 | 2 | | | | | | | | |
| Q | M Russell | 7$^7$ | 6 | | | | | | | 4 | G Kuerten | 7 | 4 | 6 | | | | | | | | |
| | R Štěpánek | 6$^4$ | 4 | | Q | M Russell | 6 | 4 | 2 | | | | | | | | | | | | | |
| Q | M Verkerk | 6$^5$ | 4 | | 4 | G Kuerten | 4 | 6 | 6 | | | | | | | | | | | | | |
| 4 | G Kuerten | 7$^7$ | 6 | | | | | | | | | | | | 4 | G Kuerten | 6 | 6 | | | | |
| 8 | D Sanguinetti | 3 | 3 | | | | | | | | | | | | | M Zabaleta | 3 | 3 | | | | |
| | R Sluiter | 6 | 6 | | | R Sluiter | 3 | 6 | 1 | | | | | | | | | | | | | |
| | S Koubek | 6 | 6 | | | S Koubek | 6 | 3 | 6 | | | | | | | | | | | | | |
| WC | M Nielsen | 3 | 2 | | | | | | | | S Koubek | 2 | 1 | | | | | | | | | |
| | A Dupuis | 3 | 4 | | | | | | | | M Zabaleta | 6 | 6 | | | | | | | | | |
| | V Spadea | 6 | 6 | | | V Spadea | 4 | 3 | | | | | | | | | | | | | | |
| | M Zabaleta | 2 | 7$^7$ | 6 | | M Zabaleta | 6 | 6 | | | | | | | | | | | | | | |
| 2 | D Nalbandian | 6 | 6$^3$ | 3 | | | | | | | | | | | | | | | | | | |