# 2005 Grand Prix de Tennis de Lyon – Singles

Robin Söderling was the defending champion, but did not participate this year.
Andy Roddick won the tournament, beating Gaël Monfils 6–3, 6–2 in the final.

## Seeds

* Andy Roddick (champion)
* Mariano Puerta (first round)
* Gastón Gaudio (second round)
* Ivan Ljubičić (first round)
* Tommy Robredo (second round)
* David Ferrer (first round)
* Mario Ančić (quarterfinals)
* Robby Ginepri (first round, retired due to a stomach virus)

## 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 | Andy Roddick | 6 | 7$^7$ | | | | |
| | Fabrice Santoro | 4 | 6$^5$ | | | | |
| | Fabrice Santoro | 4 | 6$^5$ | 1 | Andy Roddick | 6 | 6 |
| | | | | | Gaël Monfils | 3 | 2 |
| | Gaël Monfils | 6 | 7 | | Gaël Monfils | 3 | 2 |
| | Sébastien Grosjean | 4 | 5 | | | | |

### Top half

| 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 | 7 | 6 | | | | | | | | | | | | | |
| WC | T Ascione | 5 | 3 | 1 | A Roddick | 7$^7$ | 6 | | | | | | | | | |
| Q | N Mahut | 6 | 7 | Q | N Mahut | 6$^5$ | 3 | | | | | | | | | |
| WC | J Benneteau | 4 | 5 | | | | | | 1 | A Roddick | 6 | 6 | | | | |
| Q | G Carraz | 1 | 4 | | | | | | 7 | M Ančić | 4 | 4 | | | | |
| Q | T Enqvist | 6 | 6 | Q | T Enqvist | 7$^7$ | 6$^5$ | 4 | | | | | | | | |
| | J Blake | 2 | 6$^5$ | 7 | M Ančić | 6$^4$ | 7$^7$ | 6 | | | | | | | | |
| 7 | M Ančić | 6 | 7$^7$ | | | | | | | | | | 1 | A Roddick | 6 | 7$^7$ |
| 4 | I Ljubičić | 6$^5$ | 5 | | | | | | | | | | | F Santoro | 4 | 6$^5$ |
| | V Spadea | 7$^7$ | 7 | | V Spadea | 6 | 6 | | | | | | | | | |
| | X Malisse | 6$^6$ | 3 | WC | M Llodra | 4 | 3 | | | | | | | | | |
| WC | M Llodra | 7$^8$ | 6 | | | | | | | V Spadea | 2 | 2 | | | | |
| | F Santoro | 6 | 7 | | | | | | | F Santoro | 6 | 6 | | | | |
| | T Dent | 3 | 5 | | F Santoro | 6 | 6 | | | | | | | | | |
| | P-H Mathieu | 5 | | | P-H Mathieu | 1 | 4 | | | | | | | | | |
| 8 | R Ginepri | 2$^r$ | | | | | | | | | | | | | | |

### Bottom 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 |
| 6 | D Ferrer | 4 | 0 | | | | | | | | | | | | |
| Q | M Gicquel | 6 | 6 | | Q | M Gicquel | 6 | 6 | | | | | | | |
| | D Sanguinetti | 6$^5$ | 6 | 6 | | D Sanguinetti | 3 | 2 | | | | | | | |
| | F López | 7$^7$ | 4 | 4 | | | | | Q | M Gicquel | 4 | 1 | | | |
| | G Monfils | 6 | 5 | 6 | | | | | | G Monfils | 6 | 6 | | | |
| | J Hernych | 4 | 7 | 3 | | G Monfils | 6 | 6 | | | | | | | |
| | A Clément | 3 | 6 | 3 | 3 | G Gaudio | 4 | 3 | | | | | | | |
| 3 | G Gaudio | 6 | 4 | 6 | | | | | | | | | G Monfils | 6 | 7 |
| 5 | T Robredo | 2 | 7 | 6 | | | | | | | | | S Grosjean | 4 | 5 |
| | N Lapentti | 6 | 5 | 4 | 5 | T Robredo | 5 | 3 | | | | | | | |
| | S Grosjean | 4 | 6 | 6 | | S Grosjean | 7 | 6 | | | | | | | |
| | V Hănescu | 6 | 3 | 4 | | | | | | S Grosjean | 6 | 7$^7$ | | | |
| | N Djokovic | 7$^7$ | 6 | | | | | | | O Rochus | 3 | 6$^4$ | | | |
| | R Mello | 6$^5$ | 4 | | | N Djokovic | 6$^4$ | 5 | | | | | | | |
| | O Rochus | 4 | 7 | 6 | | O Rochus | 7$^7$ | 7 | | | | | | | |
| 2 | M Puerta | 6 | 5 | 3 | | | | | | | | | | | |