2005 Pilot Pen Tennis – Men's singles

Lleyton Hewitt was the defending champion, but did not participate.

Wildcard James Blake won the title, defeating Feliciano López 3–6, 7–5, 6–1 in the final.

Seeds
All seeds receive a bye into the second round. • # 🇷🇺 Nikolay Davydenko (second round)

• # Fernando González (third round)

• # 🇪🇸 David Ferrer (semifinals)

• # 🇪🇸 Tommy Robredo (quarterfinals)

• # 🇪🇸 Feliciano López (final)

• # 🇩🇪 Tommy Haas (third round)

• # Nicolás Massú (third round)

• # 🇧🇪 Olivier Rochus (second round)

• # 🇬🇧 Greg Rusedski (withdrew due to fatigue )

• # 🇮🇹 Filippo Volandri (second round)

• # 🇦🇹 Jürgen Melzer (second round)

• # 🇺🇸 Vincent Spadea (third round)

• # 🇫🇷 Paul-Henri Mathieu (second round)

• # 🇸🇪 Robin Söderling (second round)

• # 🇹🇭 Paradorn Srichaphan (third round)

• # 🇫🇷 Gaël Monfils (second round)