The 2003 Mercedes Cup was a tennis tournament played on outdoor clay courts at the Tennis Club Weissenhof in Stuttgart in Germany and was part of the International Series Gold of the 2003 ATP Tour. The tournament ran from July 14 through July 20, 2003.
Guillermo Coria defeated Tommy Robredo 6–2, 6–2, 6–1
- It was Coria's 2nd title of the year and the 3rd of his career.
Tomáš Cibulec / Pavel Vízner defeated Yevgeny Kafelnikov / Kevin Ullyett 3–6, 6–3, 6–4
- It was Cibulec's 2nd title of the year and the 3rd of his career. It was Vízner's 2nd title of the year and the 5th of his career.