# 2003 AAPT Championships – Singles

Tim Henman was the defending champion but did not compete that year.
Nikolay Davydenko won in the final 6–2, 7–6$^{(7–3)}$ against Kristof Vliegen.

## Seeds

* Wayne Ferreira (first round)
* Max Mirnyi (second round)
* Thomas Enqvist (first round)
* Ivan Ljubičić (second round)
* Mariano Zabaleta (quarterfinals)
* Alberto Martín (quarterfinals)
* Olivier Rochus (first round)
* Vince Spadea (second 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
* NG = Next Gen Accelerator Program entrant

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| | Richard Krajicek | 6$^1$ | 6 | 3 | | | | |
| Q | Kristof Vliegen | 7$^7$ | 4 | 6 | | | | |
| Q | Kristof Vliegen | 7$^7$ | 4 | 6 | Q | Kristof Vliegen | 2 | 6$^3$ |
| | | | | | | Nikolay Davydenko | 6 | 7$^7$ |
| | Nikolay Davydenko | 6 | 6 | | | Nikolay Davydenko | 6 | 7$^7$ |
| | Adrian Voinea | 2 | 1 | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | W Ferreira | 6$^4$ | 2 | | | | | | | | | | | | | | |
| | F Squillari | 7$^7$ | 6 | | | F Squillari | 4 | 3 | | | | | | | | | |
| WC | S Draper | 6$^4$ | 4 | | | R Krajicek | 6 | 6 | | | | | | | | | |
| | R Krajicek | 7$^7$ | 6 | | | | | | | R Krajicek | 6 | 6 | | | | | |
| WC | A Kennedy | 6 | 2 | 0 | | | | | | B Vahaly | 1 | 3 | | | | | |
| | B Vahaly | 4 | 6 | 6 | | B Vahaly | 7$^7$ | 6 | | | | | | | | | |
| WC | T Reid | 6 | 3 | 3 | 8 | V Spadea | 6$^1$ | 2 | | | | | | | | | |
| 8 | V Spadea | 3 | 6 | 6 | | | | | | | | | | R Krajicek | 6$^1$ | 6 | 3 |
| 3 | T Enqvist | 6 | 4 | 3 | | | | | | | | | Q | K Vliegen | 7$^7$ | 4 | 6 |
| Q | K Vliegen | 3 | 6 | 6 | Q | K Vliegen | 6 | 6 | | | | | | | | | |
| Q | A Parmar | 6$^5$ | 6 | 6 | Q | A Parmar | 2 | 2 | | | | | | | | | |
| | H Levy | 7$^7$ | 4 | 1 | | | | | Q | K Vliegen | 6 | 6 | | | | | |
| | A Di Pasquale | 6 | 3 | 4 | | | | | 6 | A Martín | 3 | 4 | | | | | |
| Q | R Gasquet | 3 | 6 | 6 | Q | R Gasquet | 5 | 1 | | | | | | | | | |
| | J Melzer | 1 | 3 | | 6 | A Martín | 7 | 6 | | | | | | | | | |
| 6 | A Martín | 6 | 6 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals |
| 5 | M Zabaleta | 6 | 6 | | | | | | | | | | | | | |
| | A Waske | 1 | 4 | | 5 | M Zabaleta | 6 | 6 | | | | | | | | |
| Q | F Serra | 3 | 4 | | | M Verkerk | 4 | 4 | | | | | | | | |
| | M Verkerk | 6 | 6 | | | | | | | 5 | M Zabaleta | 6$^3$ | 1 | | | |
| | N Davydenko | 6 | 7$^7$ | | | | | | | | N Davydenko | 7$^7$ | 6 | | | |
| | I Labadze | 2 | 6$^5$ | | | N Davydenko | 4 | 6 | 7$^{11}$ | | | | | | | |
| | J Morrison | 4 | 3 | | 4 | I Ljubičić | 6 | 4 | 6$^9$ | | | | | | | |
| 4 | I Ljubičić | 6 | 6 | | | | | | | | | | | N Davydenko | 6 | 6 |
| 7 | O Rochus | 1 | 6 | 6$^4$ | | | | | | | | | | A Voinea | 2 | 1 |
| | A Voinea | 6 | 4 | 7$^7$ | | A Voinea | 6 | 6 | | | | | | | | |
| | A Kim | 2 | 6 | 6 | | A Kim | 4 | 1 | | | | | | | | |
| | A Sávolt | 6 | 3 | 3 | | | | | | | A Voinea | 7$^8$ | 6 | | | |
| | A Dupuis | 6 | 6 | | | | | | | | A Dupuis | 6$^6$ | 4 | | | |
| | K Beck | 4 | 3 | | | A Dupuis | 7$^7$ | 6 | | | | | | | | |
| | S Galvani | 6$^5$ | 2 | | 2 | M Mirnyi | 6$^3$ | 3 | | | | | | | | |
| 2 | M Mirnyi | 7$^7$ | 6 | | | | | | | | | | | | | |