2003 Open 13 – Singles

Thomas Enqvist was the defending champion but lost in the first round to Raemon Sluiter.

Roger Federer won in the final 6–2, 7–6(8–6) against Jonas Björkman.

Seeds

 * 1)  Roger Federer (champion)
 * 2) 🇨🇿 Jiří Novák (first round)
 * 3) 🇫🇷 Sébastien Grosjean (second round)
 * 4) 🇩🇪 Rainer Schüttler (withdrew because of an elbow injury)
 * 5) 🇲🇦 Younes El Aynaoui (first round)
 * 6) 🇷🇺 Yevgeny Kafelnikov (first round)
 * 7) 🇫🇷 Fabrice Santoro (first round)
 * 8) 🇪🇸 Tommy Robredo (first round)