2003 MercedesCup – Singles

Mikhail Youzhny was the defending champion but lost in the quarterfinals to Guillermo Coria.

Coria won in the final 6–2, 6–2, 6–1 against Tommy Robredo.

Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated. All sixteen seeds received a bye to the second round. • # 🇪🇸 Carlos Moyá (second round)

• # 🇦🇷 Guillermo Coria (champion)

• # 🇩🇪 Rainer Schüttler (quarterfinals)

• # 🇫🇷 Sébastien Grosjean (second round)

• # 🇨🇿 Jiří Novák (third round)

• # Fernando González (semifinals)

• # 🇪🇸 Félix Mantilla (second round)

• # 🇪🇸 Albert Costa (second round)

• # 🇪🇸 Tommy Robredo (final)

• # 🇲🇦 Younes El Aynaoui (third round)

• # 🇫🇮 Jarkko Nieminen (third round)

• # 🇷🇺 Mikhail Youzhny (quarterfinals)

• # 🇧🇾 Max Mirnyi (third round)

• # 🇷🇺 Nikolay Davydenko (third round)

• # 🇪🇸 Àlex Corretja (third round)

• # Ivan Ljubičić (second round)