Thomas Haas is a German former professional tennis player. After breaking into the world top 100 in 1997, and reaching a career-high singles ranking of world No. 2 in May 2002, Haas’s career was interrupted by injuries: he has twice dropped out of the world rankings due to being unable to play for twelve months. Haas has reached the semifinals of the Australian Open three times, and Wimbledon once. He reached the quarterfinal stage of each of the Grand Slams. He has won 15 career titles in singles, including one Masters tournament (Stuttgart) in 2001, and has a silver medal from the 2000 Summer Olympics.
In April 2017, Haas won his first match at ATP-level in 21 months in Houston. At the age of 39, he defeated the almost 20 years younger Reilly Opelka in the first round. This victory made him the oldest player to win a ATP Tour match since Jimmy Connors in 1995.
On 15 March 2018, he officially announced his retirement from the ATP World Tour.