# 2003 Delray Beach International Tennis Championships – Singles

Davide Sanguinetti was the defending champion but did not compete that year.
Jan-Michael Gambill won in the final 6–0, 7–6$^{(7–5)}$ against Mardy Fish.

## Seeds

* Andy Roddick (first round, retired)
* Guillermo Coria (first round)
* Marcelo Ríos (semifinals)
* Jan-Michael Gambill (champion)
* Arnaud Clément (first round)
* Raemon Sluiter (first round)
* Stefan Koubek (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

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| | Mardy Fish | 6 | 6 | | | | | |
| WC/3 | Marcelo Ríos | 3 | 4 | | | | | |
| WC/3 | Marcelo Ríos | 3 | 4 | | | Mardy Fish | 0 | 6$^5$ |
| | | | | | 4 | Jan-Michael Gambill | 6 | 7$^7$ |
| 4 | Jan-Michael Gambill | 6 | 2 | 7$^7$ | 4 | Jan-Michael Gambill | 6 | 7$^7$ |
| Q | Robert Kendrick | 3 | 6 | 6$^5$ | | | | |

### Top 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 | Semifinals |
| 1 | A Roddick | 6$^4$ | 3$^r$ | | | | | | | | | | | | | | |
| | M Fish | 7$^7$ | 4 | | | M Fish | 6 | 7$^7$ | | | | | | | | | |
| | F Meligeni | 6 | 6 | | | F Meligeni | 2 | 6$^4$ | | | | | | | | | |
| | A Sávolt | 3 | 4 | | | | | | | | M Fish | 6 | 6 | | | | |
| | A Martín | 6 | 3 | 6 | | | | | | | A Martín | 3 | 3 | | | | |
| | B Vahaly | 4 | 6 | 3 | | A Martín | 6 | 6 | | | | | | | | | |
| | I Labadze | 7$^8$ | 7 | | | I Labadze | 4 | 2 | | | | | | | | | |
| 6 | R Sluiter | 6$^6$ | 5 | | | | | | | | | | | | M Fish | 6 | 6 |
| WC/3 | M Ríos | 6 | 6 | | | | | | | | | | | WC/3 | M Ríos | 3 | 4 |
| | J Morrison | 3 | 3 | | WC/3 | M Ríos | 2 | 6 | 7 | | | | | | | | |
| | M Verkerk | 7$^7$ | 6 | | | M Verkerk | 6 | 4 | 5 | | | | | | | | |
| Q | R Mello | 6$^5$ | 4 | | | | | | | WC/3 | M Ríos | 6 | 6 | | | | |
| | A Sá | 5 | 2 | | | | | | | | H-T Lee | 3 | 4 | | | | |
| | H-T Lee | 7 | 6 | | | H-T Lee | 6 | 6 | | | | | | | | | |
| | M Kratochvil | 6 | 7$^7$ | | | M Kratochvil | 2 | 3 | | | | | | | | | |
| 5 | A Clément | 3 | 6$^5$ | | | | | | | | | | | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | V Spadea | 6 | 6 | | | | | | | | | | | | | | | | |
| Q | M Llodra | 3 | 0 | | 8 | V Spadea | 4 | 6 | 4 | | | | | | | | | | |
| | F Saretta | 6 | 6 | | | F Saretta | 6 | 3 | 6 | | | | | | | | | | |
| Q | P Goldstein | 4 | 4 | | | | | | | | F Saretta | 6 | 6$^3$ | 0 | | | | | |
| WC | J Gimelstob | 6 | 6 | | | | | | | 4 | J-M Gambill | 4 | 7$^7$ | 6 | | | | | |
| LL | A Bogomolov, Jr. | 4 | 0 | | WC | J Gimelstob | 5 | 5 | | | | | | | | | | | |
| | N Kiefer | 2 | 4 | | 4 | J-M Gambill | 7 | 7 | | | | | | | | | | | |
| 4 | J-M Gambill | 6 | 6 | | | | | | | | | | | | 4 | J-M Gambill | 6 | 2 | 7$^7$ |
| 7 | S Koubek | 4 | 4 | | | | | | | | | | | | Q | R Kendrick | 3 | 6 | 6$^5$ |
| Q | R Kendrick | 6 | 6 | | Q | R Kendrick | 7 | 7 | | | | | | | | | | | |
| | J-R Lisnard | 6 | 4 | 6 | | J-R Lisnard | 5 | 5 | | | | | | | | | | | |
| | L Burgsmüller | 2 | 6 | 2 | | | | | | Q | R Kendrick | 6 | 6 | | | | | | |
| | V Voltchkov | 6 | 6 | | | | | | | | V Voltchkov | 0 | 4 | | | | | | |
| WC | A Kim | 4 | 4 | | | V Voltchkov | 5 | 6 | 1 | | | | | | | | | | |
| | S Sargsian | 7 | 6 | | | S Sargsian | 7 | 4 | 0$^r$ | | | | | | | | | | |
| 2 | G Coria | 5 | 2 | | | | | | | | | | | | | | | | |