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

 * 1) 🇩🇪 Rainer Schüttler (first round)
 * 2) 🇮🇹 Filippo Volandri (semifinals)
 * 3) 🇵🇪 Luis Horna (first round)
 * 4) 🇫🇷 Fabrice Santoro (first round)
 * 5) 🇩🇪 Florian Mayer (second round)
 * 6) 🇦🇷 Mariano Puerta (champion)
 * 7) 🇱🇺 Gilles Müller (quarterfinals)
 * 8) 🇧🇪 Christophe Rochus (quarterfinals)