Began playing tennis around age of 4 at the local club with his father.
Father, Heinz, is an engineer; mother, Claudia, is an insurance businesswoman; older brother, Christopher; sister, Sabrina.
Speaks German, English, French, Italian and some Spanish.
Coached from age 6 to 12 by David King and the Regional German Tennis Association, and by Robert Flego from age 12 to 17.
Idols while growing up were Marat Safin and David Nalbandian.
Hobbies include playing golf, drums, piano, reading books and hanging out with friends.
Did not play from October 2013 to February 2015 and March 2015 to March 2016 while recovering from hip and pelvic surgeries.
Underwent right wrist surgerieson 28 February 2018 and 27 July 2018, limiting him to only 2 tournaments that season.
(UPDATED 6 JULY 2021)
Broke into Top 100 in October 2011, achieved career-high No. 71 in February 2012 andunranked as recently as June 2019 following 2 right wrist surgeries.
Advanced to 1st ATP Tour SF and final at 2019 Gstaad as World No. 455, becoming lowest-ranked ATP Tour finalist since No. 866 Sluiter at 2009 's-Hertogenbosch.
Reached Grand Slam 2R at 2012 Roland Garros, 2012 US Open, 2017 US Open as Q and 2019 US Open.
Owns 123-68 Challenger record (8-4 in finals), capturing most recent title at 2020 Parma-2.
Peaked at No. 6 in junior rankings, winning 2008 US Open boys’ doubles title w/N. Moser.
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