# 2005 Grand Prix Hassan II – Singles

Santiago Ventura was the defending champion, but lost in the second round.
Mariano Puerta won the title, defeating Juan Mónaco 6–4, 6–1 in the final.

## Seeds

* Rainer Schüttler (first round)
* Filippo Volandri (semifinals)
* Luis Horna (first round)
* Fabrice Santoro (first round)
* Florian Mayer (second round)
* Mariano Puerta (champion)
* Gilles Müller (quarterfinals)
* Christophe Rochus (quarterfinals)

## 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 |
| | Tomáš Zíb | 2 | 4 | | | | |
| | Juan Mónaco | 6 | 6 | | | | |
| | Juan Mónaco | 6 | 6 | | Juan Mónaco | 4 | 1 |
| | | | | 6 | Mariano Puerta | 6 | 6 |
| 6 | Mariano Puerta | 6 | 7$^8$ | 6 | Mariano Puerta | 6 | 6 |
| 2 | Filippo Volandri | 3 | 6$^6$ | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarter-finals | Quarter-finals | Quarter-finals | Quarter-finals | Quarter-finals | Semi-finals | Semi-finals | Semi-finals |
| 1 | R Schüttler | 2 | 2 | | | | | | | | | | | | | | |
| | T Zíb | 6 | 6 | | | T Zíb | 6 | 6 | | | | | | | | | |
| | S Ventura | 7 | 6 | | | S Ventura | 4 | 1 | | | | | | | | | |
| WC | H Arazi | 5 | 3 | | | | | | | | T Zíb | 6 | 7$^9$ | | | | |
| Q | T Ascione | 5 | 4 | | | | | | | 8 | C Rochus | 1 | 6$^7$ | | | | |
| | D Sánchez | 7 | 6 | | | D Sánchez | 5 | 6 | 3 | | | | | | | | |
| WC | M Tahiri | 3 | 2 | | 8 | C Rochus | 7 | 4 | 6 | | | | | | | | |
| 8 | C Rochus | 6 | 6 | | | | | | | | | | | | T Zíb | 2 | 4 |
| 4 | F Santoro | 4 | 6 | 3 | | | | | | | | | | | J Mónaco | 6 | 6 |
| | J Vaněk | 6 | 3 | 6 | | J Vaněk | 4 | 6 | 3 | | | | | | | | |
| Q | G Simon | 6 | 3 | 6 | Q | G Simon | 6 | 3 | 6 | | | | | | | | |
| | J Acasuso | 3 | 6 | 3 | | | | | | Q | G Simon | 6 | 2 | 5 | | | |
| | D Sanguinetti | 6$^5$ | 4 | | | | | | | | J Mónaco | 4 | 6 | 7 | | | |
| | J Mónaco | 7$^7$ | 6 | | | J Mónaco | 7$^7$ | 6 | | | | | | | | | |
| | B Ulihrach | 2 | 1 | | 5 | F Mayer | 6$^4$ | 0 | | | | | | | | | |
| 5 | F Mayer | 6 | 6 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarter-finals | Quarter-finals | Quarter-finals | Quarter-finals | Quarter-finals | Semi-finals | Semi-finals | Semi-finals | Semi-finals |
| 6 | M Puerta | 6 | 6 | | | | | | | | | | | | | | | |
| | T Behrend | 4 | 1 | | 6 | M Puerta | 6 | 7$^7$ | | | | | | | | | | |
| | N Almagro | 6 | 6 | | | N Almagro | 3 | 6$^2$ | | | | | | | | | | |
| | L Burgsmüller | 2 | 2 | | | | | | | 6 | M Puerta | 4 | 6 | 6 | | | | |
| Q | M Gicquel | 1 | 7 | 6 | | | | | | | A Clément | 6 | 1 | 2 | | | | |
| Q | M Mertiňák | 6 | 5 | 4 | Q | M Gicquel | 4 | 4 | | | | | | | | | | |
| | A Clément | 7 | 6 | | | A Clément | 6 | 6 | | | | | | | | | | |
| 3 | L Horna | 5 | 2 | | | | | | | | | | | | 6 | M Puerta | 6 | 7$^8$ |
| 7 | G Müller | 7 | 6 | | | | | | | | | | | | 2 | F Volandri | 3 | 6$^6$ |
| | J-R Lisnard | 5 | 2 | | 7 | G Müller | 6 | 6 | | | | | | | | | | |
| | J Tipsarevic | 7 | 6 | | | J Tipsarevic | 3 | 4 | | | | | | | | | | |
| | O Mutis | 5 | 3 | | | | | | | 7 | G Müller | 6$^0$ | 1 | | | | | |
| | J Nieminen | 6 | 7$^7$ | | | | | | | 2 | F Volandri | 7$^7$ | 6 | | | | | |
| | V Hănescu | 3 | 6$^2$ | | | J Nieminen | 6 | 1 | 4 | | | | | | | | | |
| WC | Y El Aynaoui | 3 | 6$^5$ | | 2 | F Volandri | 3 | 6 | 6 | | | | | | | | | |
| 2 | F Volandri | 6 | 7$^7$ | | | | | | | | | | | | | | | |