2003 Mercedes-Benz Cup – Singles

Andre Agassi was the defending champion but did not compete that year.

Wayne Ferreira won in the final 6–3, 4–6, 7–5 against Lleyton Hewitt.

Seeds

 * 1) 🇦🇺 Lleyton Hewitt (final)
 * 2) 🇫🇷 Sébastien Grosjean (quarterfinals)
 * 3)  Sjeng Schalken (second round)
 * 4) 🇧🇷 Gustavo Kuerten (quarterfinals)
 * 5) 🇦🇺 Mark Philippoussis (semifinals)
 * 6) 🇷🇺 Marat Safin (first round)
 * 7)  Wayne Ferreira (champion)
 * 8) 🇺🇸 Vince Spadea (quarterfinals)