The 2003 BellSouth Open was a men's tennis tournament played on outdoor clay courts in Viña del Mar in Chile and was part of the International Series of the 2003 ATP Tour. It was the tenth edition of the tournament and ran from February 10 through February 16, 2003. David Sánchez won the singles title.
David Sánchez defeated Marcelo Ríos 1–6, 6–3, 6–3
- It was Sánchez's 1st title of the year and the 1st of his career.
Agustín Calleri / Mariano Hood defeated František Čermák / Leoš Friedl 6–3, 1–6, 6–4
- It was Calleri's 1st title of the year and the 1st of his career. It was Hood's 1st title of the year and the 5th of his career.