# 2003 BCR Open Romania – Singles

David Ferrer was the defending champion but lost in the first round to Galo Blanco.
David Sánchez won in the final 6–2, 6–2 against Nicolás Massú.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
* Nikolay Davydenko (first round)
* Nicolás Massú (final)
* Sargis Sargsian (quarterfinals)
* David Sánchez (champion)
* Paul-Henri Mathieu (quarterfinals)
* David Ferrer (first round)
* Fernando Vicente (first round)
* Alberto Martín (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
| 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 | Final | Final | Final | Final |
| 1 | N Davydenko | 5 | 7$^7$ | 0 | | | | | | | | | | | | | | | | | | | |
| Q | I Andreev | 7 | 6$^1$ | 6 | Q | I Andreev | 2 | 6 | 2 | | | | | | | | | | | | | | |
| Q | A Seppi | 6 | 3 | 4 | | J Acasuso | 6 | 4 | 6 | | | | | | | | | | | | | | |
| | J Acasuso | 2 | 6 | 6 | | | | | | | J Acasuso | 4 | 6 | 6 | | | | | | | | | |
| | J van Lottum | 3 | 6 | 6 | | | | | | | J van Lottum | 6 | 2 | 3 | | | | | | | | | |
| | A Montañés | 6 | 2 | 0 | | J van Lottum | 6 | 7$^8$ | | | | | | | | | | | | | | | |
| | G Blanco | 6 | 6 | | | G Blanco | 1 | 6$^6$ | | | | | | | | | | | | | | | |
| 6 | D Ferrer | 2 | 3 | | | | | | | | | | | | | J Acasuso | 7$^7$ | 6$^6$ | 3 | | | | |
| 4 | D Sánchez | 6 | 6 | | | | | | | | | | | | 4 | D Sánchez | 6$^4$ | 7$^8$ | 6 | | | | |
| | À Corretja | 2 | 3 | | 4 | D Sánchez | 7$^7$ | 6 | | | | | | | | | | | | | | | |
| | K Beck | 6 | 1 | 6$^9$ | | J Melzer | 6$^2$ | 4 | | | | | | | | | | | | | | | |
| | J Melzer | 4 | 6 | 7$^{11}$ | | | | | | 4 | D Sánchez | 6 | 3 | 6 | | | | | | | | | |
| | A Portas | 6 | 6 | | | | | | | 5 | P-H Mathieu | 4 | 6 | 3 | | | | | | | | | |
| WC | G Moraru | 3 | 1 | | | A Portas | 2 | 1 | | | | | | | | | | | | | | | |
| | S Koubek | 2 | 3 | | 5 | P-H Mathieu | 6 | 6 | | | | | | | | | | | | | | | |
| 5 | P-H Mathieu | 6 | 6 | | | | | | | | | | | | | | | | | 4 | David Sánchez | 6 | 6 |
| 8 | A Martín | 6 | 6 | | | | | | | | | | | | | | | | | 2 | Nicolás Massú | 2 | 2 |
| | O Mutis | 3 | 2 | | 8 | A Martín | 4 | 6 | 4 | | | | | | | | | | | | | | |
| | R Ramírez Hidalgo | 3 | 1 | | WC | R Sabău | 6 | 0 | 6 | | | | | | | | | | | | | | |
| WC | R Sabău | 6 | 6 | | | | | | | WC | R Sabău | 2 | 6 | 6 | | | | | | | | | |
| WC | I Moldovan | 6 | 6 | | | | | | | 3 | S Sargsian | 6 | 3 | 4 | | | | | | | | | |
| | T Behrend | 4 | 1 | | WC | I Moldovan | 5 | 1 | | | | | | | | | | | | | | | |
| | F Squillari | 2 | 2 | | 3 | S Sargsian | 7 | 6 | | | | | | | | | | | | | | | |
| 3 | S Sargsian | 6 | 6 | | | | | | | | | | | | WC | R Sabău | 1 | 4 | | | | | |
| 7 | F Vicente | 3 | 0 | | | | | | | | | | | | 2 | N Massú | 6 | 6 | | | | | |
| | C Rochus | 6 | 6 | | | C Rochus | 3 | 4 | | | | | | | | | | | | | | | |
| | V Hănescu | 4 | 6 | 7$^9$ | | V Hănescu | 6 | 6 | | | | | | | | | | | | | | | |
| Q | A Waske | 6 | 4 | 6$^7$ | | | | | | | V Hănescu | 4 | 1 | | | | | | | | | | |
| | L Burgsmüller | 7$^7$ | 4 | 2 | | | | | | 2 | N Massú | 6 | 6 | | | | | | | | | | |
| Q | F Čermák | 6$^3$ | 6 | 6 | Q | F Čermák | 3 | 3 | | | | | | | | | | | | | | | |
| | L Horna | 6$^4$ | 3 | | 2 | N Massú | 6 | 6 | | | | | | | | | | | | | | | |
| 2 | N Massú | 7$^7$ | 6 | | | | | | | | | | | | | | | | | | | | |