# 2003 Qatar Open – Singles

Younes El Aynaoui was the defending champion but lost in the semifinals to Stefan Koubek.
Koubek won in the final 6–4, 6–4 against Jan-Michael Gambill.

## Seeds

* Roger Federer (quarterfinals)
* Albert Costa (second round)
* Younes El Aynaoui (semifinals)
* Yevgeny Kafelnikov (first round)
* Greg Rusedski (withdrew)
* Mikhail Youzhny (semifinals)
* Nicolas Escudé (first round)
* Fabrice Santoro (quarterfinals)
* Jan-Michael Gambill (final)

## 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 |
| 9 | Jan-Michael Gambill | 6 | 6 | | | | |
| 6 | Mikhail Youzhny | 4 | 2 | | | | |
| 6 | Mikhail Youzhny | 4 | 2 | 9 | Jan-Michael Gambill | 4 | 4 |
| | | | | | Stefan Koubek | 6 | 6 |
| 3 | Younes El Aynaoui | 6$^1$ | 6$^5$ | | Stefan Koubek | 6 | 6 |
| | Stefan Koubek | 7$^7$ | 7$^7$ | | | | |

### 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 Federer | 6 | 6$^4$ | 6 | | | | | | | | | | | | |
| LL | A Stoliarov | 2 | 7$^7$ | 4 | 1 | R Federer | 6 | 6 | | | | | | | | |
| | M Kratochvil | 6 | 6 | | | M Kratochvil | 4 | 4 | | | | | | | | |
| WC | S Khalfan | 0 | 4 | | | | | | 1 | R Federer | 4 | 5 | | | | |
| | R Sluiter | 3 | 7$^7$ | 4 | | | | | 9 | J-M Gambill | 6 | 7 | | | | |
| | D Ferrer | 6 | 6$^2$ | 6 | | D Ferrer | 6$^5$ | 4 | | | | | | | | |
| | I Heuberger | 1 | 5 | | 9 | J-M Gambill | 7$^7$ | 6 | | | | | | | | |
| 9 | J-M Gambill | 6 | 7 | | | | | | | | | | 9 | J-M Gambill | 6 | 6 |
| 4 | Y Kafelnikov | 2 | 5 | | | | | | | | | | 6 | M Youzhny | 4 | 2 |
| | F Vicente | 6 | 7 | | | F Vicente | 7 | 7$^7$ | | | | | | | | |
| Q | M Hantschk | 7$^7$ | 6 | | Q | M Hantschk | 5 | 6$^3$ | | | | | | | | |
| | K Carlsen | 6$^3$ | 1 | | | | | | | F Vicente | 6$^7$ | 3 | | | | |
| | R Štěpánek | 6$^4$ | 6 | 6 | | | | | 6 | M Youzhny | 7$^9$ | 6 | | | | |
| | F López | 7$^7$ | 3 | 2 | | R Štěpánek | 3 | 1 | | | | | | | | |
| | D Sánchez | 6 | 4 | 4 | 6 | M Youzhny | 6 | 6 | | | | | | | | |
| 6 | M Youzhny | 4 | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | F Santoro | 6 | 6 | | | | | | | | | | | | | | | |
| | F Mantilla | 3 | 3 | | 8 | F Santoro | 7 | 6$^8$ | 7 | | | | | | | | | |
| WC | Y Allegro | 3 | 2 | | Q | C Rochus | 5 | 7$^{10}$ | 5 | | | | | | | | | |
| Q | C Rochus | 6 | 6 | | | | | | | 8 | F Santoro | 6 | 3 | 3 | | | | |
| | H Arazi | 6 | 6 | | | | | | | 3 | Y El Aynaoui | 3 | 6 | 6 | | | | |
| Q | D Prinosil | 2 | 3 | | | H Arazi | 4 | 6$^1$ | | | | | | | | | | |
| | J Boutter | 4 | 4 | | 3 | Y El Aynaoui | 6 | 7$^7$ | | | | | | | | | | |
| 3 | Y El Aynaoui | 6 | 6 | | | | | | | | | | | | 3 | Y El Aynaoui | 6$^1$ | 6$^5$ |
| 7 | N Escudé | 6$^5$ | 2 | | | | | | | | | | | | | S Koubek | 7$^7$ | 7$^7$ |
| | S Koubek | 7$^7$ | 6 | | | S Koubek | 6 | 6 | | | | | | | | | | |
| | V Voltchkov | 6 | 3 | 7 | | V Voltchkov | 1 | 1 | | | | | | | | | | |
| | H-T Lee | 4 | 6 | 5 | | | | | | | S Koubek | 6 | 6 | | | | | |
| Q | A Vinciguerra | 2 | 6 | 6 | | | | | | Q | A Vinciguerra | 3 | 4 | | | | | |
| WC | K Alami | 6 | 4 | 1 | Q | A Vinciguerra | 3 | 7$^7$ | 7 | | | | | | | | | |
| | A Gaudenzi | 3 | 4 | | 2 | A Costa | 6 | 6$^5$ | 5 | | | | | | | | | |
| 2 | A Costa | 6 | 6 | | | | | | | | | | | | | | | |