The 2003 MercedesCup was a men's tennis tournament played on outdoor clay courts at the Tennis Club Weissenhof in Stuttgart, Germany and was part of the International Series Gold of the 2003 ATP Tour.

The tournament was held from 14 July until 20 July 2003.

Second-seeded Guillermo Coria won the singles.

Guillermo Coria defeated Tommy Robredo 6–2, 6–2, 6–1 Tomáš Cibulec / Pavel Vízner defeated Yevgeny Kafelnikov / Kevin Ullyett 3–6, 6–3, 6–4