- Had a 2nd child at age 37, a daughter named Josephine Lena Haas born on November 11, 2015. Child's mother is his wife, Sara Foster.
- Became a father for the 1st time at age 32, when he had a daughter named Valentina Haas born on November 14, 2010. Child's mother is his wife, Sara Foster.
- Professional tennis player. He has won 7 ATP tournaments.
- His father Peter, a former European champion in judo, went to school with Arnold Schwarzenegger in Graz, Austria.
- His father gave him the middle name Mario because he was a fan of race driver Mario Andretti.
- After his parents had been severely injured in a motorcycle accident in Sarasota, Florida, he skipped Wimbledon during their rehabilitation (2002).
- Was romantically linked to Giulia Siegel for a while.
- Son-in-law of David Foster.
- Brother-in-law of Erin Foster.
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