The Mercedes Cup is an ATP World Tour 250 series tennis tournament on the ATP Tour. Held since 1916 in Stuttgart, Germany, the Mercedes Cup is played on clay courts. Between 1970 and 1989 this was a Grand Prix tennis circuit event.

Thomas Muster of Austria won the title twice in consecutive years (1995 and 1996).

This tournament is famous for awarding the title winner with a Mercedes car, on top of the prize money.

Tommy Haas (born 3 April 1978 as Thomas Mario Haas) is a German and recently naturalized American professional tennis player. He has competed on the ATP Tour since 1996. After breaking into the World Top 100 in 1997, and reaching a career-high singles ranking of World No. 2 on 13 May 2002, Haas's career has been interrupted by injuries: whilst a professional, he has twice dropped out of the world rankings due to being inactive for twelve months. His first period of injury saw him miss the whole of the 2003 season, and he did not return to the world's top ten until 2007. He also missed over a year's tennis between February 2010 and June 2011, but has since returned to play on the Tour.

Haas has never won a Grand Slam tournament, his best result being three-time semi-finalist at the Australian Open and one semi-final at Wimbledon. He has won thirteen career titles in singles and doubles, including one Masters tournament, and has a silver medal from the 2000 Summer Olympics.

His equipment include Solfire, Lacoste and Nike for his clothes and shoes, respectively. He switched to using Head racquets in 2009 after using Dunlop Sport racquets for most of his career.