# 2003 St. Petersburg Open – Singles

Sébastien Grosjean was the defending champion but lost in the quarterfinals to Àlex Corretja.
Gustavo Kuerten won in the final 6–4, 6–3 against Sargis Sargsian.

## Seeds

* Rainer Schüttler (semifinals)
* Sébastien Grosjean (quarterfinals)
* Gustavo Kuerten (champion)
* Max Mirnyi (first round)
* Mikhail Youzhny (second round)
* Vince Spadea (quarterfinals)
* Gastón Gaudio (second round)
* Marat Safin (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

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Rainer Schüttler | 3 | 3 | | | | |
| | Sargis Sargsian | 6 | 6 | | | | |
| | Sargis Sargsian | 6 | 6 | | Sargis Sargsian | 4 | 3 |
| | | | | 3 | Gustavo Kuerten | 6 | 6 |
| 3 | Gustavo Kuerten | 6 | 6 | 3 | Gustavo Kuerten | 6 | 6 |
| WC | Àlex Corretja | 4 | 3 | | | | |

### 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 |
| 1 | R Schüttler | 7$^7$ | 6 | | | | | | | | | | | | | |
| Q | J-R Lisnard | 6$^5$ | 1 | | 1 | R Schüttler | 6 | 6 | | | | | | | | |
| WC | V Davletshin | 6$^3$ | 3 | | | V Voltchkov | 2 | 3 | | | | | | | | |
| | V Voltchkov | 7$^7$ | 6 | | | | | | 1 | R Schüttler | 6 | 6 | | | | |
| | N Kiefer | 6 | 3 | 4 | | | | | 5 | M Youzhny | 3 | 3 | | | | |
| | Y Kafelnikov | 2 | 6 | 6 | | Y Kafelnikov | 2 | 2 | | | | | | | | |
| | A Pavel | 7$^7$ | 6$^1$ | 1 | 5 | M Youzhny | 6 | 6 | | | | | | | | |
| 5 | M Youzhny | 6$^3$ | 7$^7$ | 6 | | | | | | | | | 1 | R Schüttler | 3 | 3 |
| 4 | M Mirnyi | 4 | 6$^1$ | | | | | | | | | | | S Sargsian | 6 | 6 |
| WC | I Andreev | 6 | 7$^7$ | | WC | I Andreev | 3 | 2 | | | | | | | | |
| | S Sargsian | 6 | 6 | | | S Sargsian | 6 | 6 | | | | | | | | |
| | R Štěpánek | 3 | 2 | | | | | | | S Sargsian | 6 | 6 | | | | |
| | L Burgsmüller | 2 | 7$^8$ | 6 | | | | | | L Burgsmüller | 3 | 1 | | | | |
| Q | A Ram | 6 | 6$^6$ | 1 | | L Burgsmüller | 6 | 6 | | | | | | | | |
| | F Vicente | 6$^2$ | 6 | 6 | | F Vicente | 4 | 4 | | | | | | | | |
| 8 | M Safin | 7$^7$ | 4 | 3 | | | | | | | | | | | | |

### 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 |
| 6 | V Spadea | 4 | 6 | 6 | | | | | | | | | | | | | | |
| | N Davydenko | 6 | 1 | 2 | 6 | V Spadea | 6 | 4 | 7 | | | | | | | | | |
| | D Ferrer | 5 | 2 | | | D Hrbatý | 4 | 6 | 5 | | | | | | | | | |
| | D Hrbatý | 7 | 6 | | | | | | | 6 | V Spadea | 4 | 6$^4$ | | | | | |
| | V Hănescu | 7 | 7 | | | | | | | 3 | G Kuerten | 6 | 7$^7$ | | | | | |
| Q | F Čermák | 5 | 5 | | | V Hănescu | 6$^1$ | 6$^1$ | | | | | | | | | | |
| | B Vahaly | 6$^5$ | 4 | | 3 | G Kuerten | 7$^7$ | 7$^7$ | | | | | | | | | | |
| 3 | G Kuerten | 7$^7$ | 6 | | | | | | | | | | | | 3 | G Kuerten | 6 | 6 |
| 7 | G Gaudio | 6$^4$ | 7$^7$ | 6 | | | | | | | | | | | WC | À Corretja | 4 | 3 |
| | A Martín | 7$^7$ | 6$^5$ | 2 | 7 | G Gaudio | 3 | 1 | | | | | | | | | | |
| Q | J Vacek | 4 | 1 | | WC | À Corretja | 6 | 6 | | | | | | | | | | |
| WC | À Corretja | 6 | 6 | | | | | | | WC | À Corretja | 4 | 6 | 7$^7$ | | | | |
| | D Sánchez | 2 | 3 | | | | | | | 2 | S Grosjean | 6 | 2 | 6$^5$ | | | | |
| | A Dupuis | 6 | 6 | | | A Dupuis | 2 | 2 | | | | | | | | | | |
| | S Koubek | 7$^7$ | 3 | 5 | 2 | S Grosjean | 6 | 6 | | | | | | | | | | |
| 2 | S Grosjean | 6$^4$ | 6 | 7 | | | | | | | | | | | | | | |