# 2003 Brasil Open – Singles

Gustavo Kuerten was the defending champion but lost in the semifinals to Rainer Schüttler.
Sjeng Schalken won in the final 6–2, 6–4 against Rainer Schüttler.

## Seeds

* Rainer Schüttler (final)
* Sjeng Schalken (champion)
* Gustavo Kuerten (semifinals)
* Fernando González (first round)
* Vince Spadea (quarterfinals)
* Juan Ignacio Chela (second round)
* Flávio Saretta (second round)
* Kenneth Carlsen (quarterfinals)

## 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 |
| 1 | Rainer Schüttler | 6 | 2 | 7 | | | | |
| 3 | Gustavo Kuerten | 4 | 6 | 5 | | | | |
| 3 | Gustavo Kuerten | 4 | 6 | 5 | 1 | Rainer Schüttler | 2 | 4 |
| | | | | | 2 | Sjeng Schalken | 6 | 6 |
| Q | Gastón Etlis | 1 | 0$^r$ | | 2 | Sjeng Schalken | 6 | 6 |
| 2 | Sjeng Schalken | 6 | 2 | | | | | |

### 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 | Semifinals |
| 1 | R Schüttler | 6 | 6 | | | | | | | | | | | | | | | |
| WC | A Sá | 2 | 0 | | 1 | R Schüttler | 6 | 6 | | | | | | | | | | |
| | P Goldstein | 6 | 6 | | | P Goldstein | 0 | 1 | | | | | | | | | | |
| | F Browne | 2 | 0 | | | | | | | 1 | R Schüttler | 6 | 6 | | | | | |
| | R Delgado | 6 | 5 | | | | | | | | R Delgado | 1 | 3 | | | | | |
| | M Puerta | 3 | 1$^r$ | | | R Delgado | 2 | 6 | 6 | | | | | | | | | |
| WC | M Daniel | 4 | 3 | | 7 | F Saretta | 6 | 3 | 4 | | | | | | | | | |
| 7 | F Saretta | 6 | 6 | | | | | | | | | | | 1 | R Schüttler | 6 | 2 | 7 |
| 3 | G Kuerten | 6 | 6 | | | | | | | | | | | 3 | G Kuerten | 4 | 6 | 5 |
| | M Norman | 3 | 2 | | 3 | G Kuerten | 6 | 6 | | | | | | | | | | |
| | W Eschauer | 5 | 7$^7$ | 7$^7$ | | W Eschauer | 2 | 1 | | | | | | | | | | |
| Q | J Silva | 7 | 6$^2$ | 6$^1$ | | | | | | 3 | G Kuerten | 6 | 6 | | | | | |
| Q | P Capdeville | 7$^7$ | 0 | 1 | | | | | | | R Mello | 2 | 2 | | | | | |
| | R Mello | 6$^4$ | 6 | 6 | | R Mello | 2 | 6 | 6 | | | | | | | | | |
| | T Larkham | 4 | 6 | 1 | 6 | J I Chela | 6 | 2 | 4 | | | | | | | | | |
| 6 | J I Chela | 6 | 2 | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | K Carlsen | 4 | 6 | 7$^{13}$ | | | | | | | | | | | | | | |
| WC | F Ferreiro | 6 | 4 | 6$^{11}$ | 8 | K Carlsen | 7 | 6$^5$ | 6 | | | | | | | | | |
| | I Miranda | 4 | 4 | | | W Moodie | 5 | 7$^7$ | 3 | | | | | | | | | |
| | W Moodie | 6 | 6 | | | | | | | 8 | K Carlsen | 4 | 7$^7$ | 3 | | | | |
| Q | G Etlis | 1 | 6 | 6 | | | | | | Q | G Etlis | 6 | 6$^2$ | 6 | | | | |
| | B Vahaly | 6 | 2 | 3 | Q | G Etlis | 7 | 4 | 7$^7$ | | | | | | | | | |
| | E Taino | 7$^7$ | 7 | | | E Taino | 5 | 6 | 6$^5$ | | | | | | | | | |
| 4 | F González | 6$^5$ | 5 | | | | | | | | | | | | Q | G Etlis | 1 | 0$^r$ |
| 5 | V Spadea | 6 | 7 | | | | | | | | | | | | 2 | S Schalken | 6 | 2 |
| | G Cañas | 4 | 5 | | 5 | V Spadea | 6 | 2 | 3 | | | | | | | | | |
| | H Gamonal | 7$^7$ | 6 | | | H Gamonal | 1 | 6 | 1$^r$ | | | | | | | | | |
| Q | M Quintero | 6$^0$ | 2 | | | | | | | 5 | V Spadea | 6$^0$ | 2 | | | | | |
| | A Popp | 1 | 6 | 1 | | | | | | 2 | S Schalken | 7$^7$ | 6 | | | | | |
| | G Carraz | 6 | 4 | 6 | | G Carraz | 5 | 4 | | | | | | | | | | |
| | C Saulnier | 6$^4$ | 6 | 3 | 2 | S Schalken | 7 | 6 | | | | | | | | | | |
| 2 | S Schalken | 7$^7$ | 2 | 6 | | | | | | | | | | | | | | |