2003 St. Petersburg Open – Singles

Sébastien Grosjean was the defending champion but lost in the quarterfinals to Àlex Corretja.

Gustavo Kuerten won in the final 6–4, 6–3 against Sargis Sargsian.

Seeds

 * 1) 🇩🇪 Rainer Schüttler (semifinals)
 * 2) 🇫🇷 Sébastien Grosjean (quarterfinals)
 * 3) 🇧🇷 Gustavo Kuerten (champion)
 * 4) 🇧🇾 Max Mirnyi (first round)
 * 5) 🇷🇺 Mikhail Youzhny (second round)
 * 6) 🇺🇸 Vince Spadea (quarterfinals)
 * 7) 🇦🇷 Gastón Gaudio (second round)
 * 8) 🇷🇺 Marat Safin (first round)