The 2003 Mercedes-Benz Cup was a tennis tournament played on outdoor hard courts at the Los Angeles Tennis Center in Los Angeles, California in the United States and was part of the International Series of the 2003 ATP Tour. The tournament ran from July 28 through August 3, 2003.
Wayne Ferreira defeated Lleyton Hewitt 6–3, 4–6, 7–5
- It was Ferreira's 2nd title of the year and the 26th of his career.
Jan-Michael Gambill / Travis Parrott defeated Joshua Eagle / Sjeng Schalken 6–4, 3–6, 7–5
- It was Gambill's 2nd title of the year and the 8th of his career. It was Parrott's only title of the year and the 1st of his career.