# 2005 Allianz Suisse Open Gstaad – Singles

Roger Federer was the defending champion, but did not participate this year.
Gastón Gaudio won the tournament, beating Stanislas Wawrinka in the final, 6–4, 6–4.

## Seeds

* Nikolay Davydenko (first round, retired due to a wrist injury)
* Gastón Gaudio (champion)
* Radek Štěpánek (second round)
* David Ferrer (first round)
* Ivan Ljubičić (second round)
* Jiří Novák (first round)
* Nicolás Massú (semifinals)
* Filippo Volandri (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 |
| Q | Răzvan Sabău | 6$^7$ | 4 | | | | |
| | Stanislas Wawrinka | 7$^9$ | 6 | | | | |
| | Stanislas Wawrinka | 7$^9$ | 6 | | Stanislas Wawrinka | 4 | 4 |
| | | | | 2 | Gastón Gaudio | 6 | 6 |
| 7 | Nicolás Massú | 3 | 2 | 2 | Gastón Gaudio | 6 | 6 |
| 2 | Gastón Gaudio | 6 | 6 | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | N Davydenko | 6 | 1$^r$ | | | | | | | | | | | | | | | |
| | S Sargsian | 1 | 0 | | | S Sargsian | 4 | 4 | | | | | | | | | | |
| WC | M Lammer | 6 | 2 | 3 | Q | R Sabău | 6 | 6 | | | | | | | | | | |
| Q | R Sabău | 3 | 6 | 6 | | | | | | Q | R Sabău | 0 | 7 | 7 | | | | |
| | I Andreev | 5 | 3 | | | | | | | | P Starace | 6 | 5 | 5 | | | | |
| | F López | 7 | 6 | | | F López | 6$^6$ | 0 | | | | | | | | | | |
| | P Starace | 6 | 6$^3$ | 7 | | P Starace | 7$^8$ | 6 | | | | | | | | | | |
| 6 | J Novák | 3 | 7$^7$ | 5 | | | | | | | | | | | Q | R Sabău | 6$^7$ | 4 |
| 3 | R Štěpánek | 7$^8$ | 6 | | | | | | | | | | | | | S Wawrinka | 7$^9$ | 6 |
| WC | Y Allegro | 6$^6$ | 1 | | 3 | R Štěpánek | 7$^7$ | 4 | 4 | | | | | | | | | |
| | P Kohlschreiber | 3 | 5 | | Q | F Čermák | 6$^5$ | 6 | 6 | | | | | | | | | |
| Q | F Čermák | 6 | 7 | | | | | | | Q | F Čermák | 4 | 6$^5$ | | | | | |
| | F Verdasco | 6 | 6 | | | | | | | | S Wawrinka | 6 | 7$^7$ | | | | | |
| Q | J Pospíšil | 2 | 4 | | | F Verdasco | 6 | 4 | 6$^8$ | | | | | | | | | |
| | S Wawrinka | 6 | 2 | 6 | | S Wawrinka | 3 | 6 | 7$^{10}$ | | | | | | | | | |
| 8 | F Volandri | 1 | 6 | 4 | | | | | | | | | | | | | | |

### 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 |
| 7 | N Massú | 7$^7$ | 7$^7$ | | | | | | | | | | | | | | | |
| | T Behrend | 6$^4$ | 6$^3$ | | 7 | N Massú | 7 | 2 | 6 | | | | | | | | | |
| | J Hernych | 7 | 6 | | | J Hernych | 5 | 6 | 4 | | | | | | | | | |
| Q | H Armando | 5 | 3 | | | | | | | 7 | N Massú | 6 | 6 | | | | | |
| | L Horna | 7$^{10}$ | 6 | | | | | | | | L Horna | 4 | 4 | | | | | |
| | T Zíb | 6$^8$ | 4 | | | L Horna | 6 | 6 | | | | | | | | | | |
| | A di Mauro | 6 | 1 | 6 | | A di Mauro | 3 | 4 | | | | | | | | | | |
| 4 | D Ferrer | 4 | 6 | 3 | | | | | | | | | | | 7 | N Massú | 3 | 2 |
| 5 | I Ljubičić | 6 | 6 | | | | | | | | | | | | 2 | G Gaudio | 6 | 6 |
| | R Mello | 3 | 2 | | 5 | I Ljubičić | 6$^4$ | 3 | | | | | | | | | | |
| | S Koubek | 7$^7$ | 6$^5$ | 6$^6$ | | A Seppi | 7$^7$ | 6 | | | | | | | | | | |
| | A Seppi | 6$^5$ | 7$^7$ | 7$^8$ | | | | | | | A Seppi | 4 | 6 | 6$^5$ | | | | |
| | R Schüttler | 7$^8$ | 2 | 3 | | | | | | 2 | G Gaudio | 6 | 1 | 7$^7$ | | | | |
| | D Sanguinetti | 6$^6$ | 6 | 6 | | D Sanguinetti | 2 | 2 | | | | | | | | | | |
| WC | G Bastl | 5 | 2 | | 2 | G Gaudio | 6 | 6 | | | | | | | | | | |
| 2 | G Gaudio | 7 | 6 | | | | | | | | | | | | | | | |