2003 CA-TennisTrophy – Singles

Roger Federer was the defending champion and won in the final 6–3, 6–3, 6–3 against Carlos Moyá.

Seeds

 * 1)   Roger Federer (champion)
 * 2) 🇪🇸 Carlos Moyá (final)
 * 3) 🇨🇿 Jiří Novák (first round)
 * 4)  Sjeng Schalken (second round)
 * 5) 🇦🇷 Agustín Calleri (second round, withdrew because of the flu)
 * 6) 🇪🇸 Tommy Robredo (first round)
 * 7)  Nicolás Massú (first round)
 * 8) 🇪🇸 Albert Costa (second round)