2003 Stella Artois Championships – Singles

Lleyton Hewitt was the three-time defending champion but lost in the quarterfinals to Sébastien Grosjean.

Andy Roddick won in the final 6–3, 6–3 against Grosjean.

Seeds
The top eight seeds received a bye to the second round.


 * 1) 🇦🇺 Lleyton Hewitt (quarterfinals)
 * 2) 🇺🇸 Andre Agassi (semifinals)
 * 3) 🇺🇸 Andy Roddick (champion)
 * 4) 🇹🇭 Paradorn Srichaphan (second round)
 * 5)  Sjeng Schalken (third round)
 * 6) 🇫🇷 Sébastien Grosjean (final)
 * 7) 🇬🇧 Tim Henman (semifinals)
 * 8) 🇧🇪 Xavier Malisse (quarterfinals)
 * 9) 🇫🇮 Jarkko Nieminen (second round)
 * 10) 🇺🇸 Jan-Michael Gambill (second round)
 * 11) 🇺🇸 Taylor Dent (quarterfinals)
 * 12) 🇧🇾 Max Mirnyi (second round)
 * 13) 🇺🇸 Mardy Fish (first round)
 * 14) 🇦🇺 Mark Philippoussis (first round)
 * 15) 🇺🇸 Robby Ginepri (first round)
 * 16) 🇦🇺 Wayne Arthurs (first round)