2003 BMW Open – SinglesYounes El Aynaoui was the defending champion but did not compete that year.Roger Federer won in the final 6–1, 6–4 against Jarkko Nieminen. He did not lose a single set in the entire tournament.Seeds Roger Federer Paradorn Srichaphan ' Sjeng Schalken ' Rainer Schüttler ' Yevgeny Kafelnikov ' Mikhail Youzhny ' Tim Henman ' Jarkko Nieminen ''''