Tennis at the 2003 Pan American Games – Men's singles

The men's singles event at the 2003 Pan American Games was held at Centro Nacional de Tenis in Santo Domingo from August 4 to August 10.

Fernando Meligeni won the gold medal by defeating Marcelo Ríos in the final, 5–7, 7–6(8–6), 7–6(7–5). It was the final match of Meligeni's career. The Bronze medal was awarded to both semifinalists.

Seeds
• # (final, silver medalist)

• # (quarterfinals)

• # (champion, gold medalist)

• # (semifinals, bronze medalist)

• # (quarterfinals)

• # (second round)

• # (quarterfinals)

• # (semifinals, bronze medalist)