2001 Gerry Weber Open – Singles

David Prinosil was the defending champion but lost in the second round to Roger Federer.

Thomas Johansson won in the final 6–3, 6–7(5–7), 6–2 against Fabrice Santoro.

Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.

• # 🇷🇺 Yevgeny Kafelnikov (semifinals)

• # 🇦🇺 Patrick Rafter (semifinals)

• # 🇫🇷 Sébastien Grosjean (second round)

• # 🇫🇷 Arnaud Clément (first round)

• # 🇪🇸 Àlex Corretja (first round)

• # Roger Federer (quarterfinals)

• # 🇸🇪 Thomas Johansson (champion)

• # 🇩🇪 Tommy Haas (second round)