2005 RCA Championships – Singles

Andy Roddick was the defending champion, but lost in the quarterfinals.

Robby Ginepri won the title, defeating Taylor Dent, who retired from the final due to heat exhaustion with Ginepri leading 4–6, 6–0, 3–0.

Seeds
• # 🇺🇸 Andy Roddick (quarterfinals)

• # 🇩🇪 Nicolas Kiefer (quarterfinals)

• # 🇸🇰 Dominik Hrbatý (second round)

• # 🇺🇸 Taylor Dent (final, retired due to heat exhaustion)

• # Mario Ančić (withdrew due to a back injury)

• # 🇧🇾 Max Mirnyi (second round)

• # 🇬🇧 Greg Rusedski (semifinals)

• # 🇺🇸 Vincent Spadea (second round)

• # 🇹🇭 Paradorn Srichaphan (third round)

• # 🇸🇰 Karol Beck (semifinals)

• # 🇫🇷 Cyril Saulnier (second round)

• # Kenneth Carlsen (third round)

• # 🇨🇿 Jan Hernych (second round)

• # 🇰🇷 Lee Hyung-taik (second round)

• # 🇧🇪 Xavier Malisse (second round)

• # 🇺🇸 Mardy Fish (third round, retired due to a wrist injury)