2005 Mercedes-Benz Cup – Singles

Tommy Haas was the defending champion, but lost in the second round this year.

Andre Agassi won the tournament, beating Gilles Müller in the final, 6–4, 7–5.

Seeds
• # 🇺🇸 Andre Agassi (champion)

• # 🇸🇰 Dominik Hrbatý (semifinals)

• # 🇩🇪 Nicolas Kiefer (first round, retired due to a throat infection)

• # 🇩🇪 Tommy Haas (second round)

• # 🇺🇸 Taylor Dent (withdrew due to heat exhaustion)

• # Mario Ančić (first round)

• # 🇫🇷 Sébastien Grosjean (first round)

• # 🇬🇧 Greg Rusedski (withdrew due to a neck injury)

• # 🇺🇸 Vincent Spadea (first round)