Web Reference: Tennis star Jannik Sinner’s older brother, Mark, is a fire brigade instructor in South Tyrol in the Italian Dolomites. Jannik Sinner grew up with his brother Mark Sinner, who was born in Russia in 1998 and was adopted by Jannik’s parents when he was 9 months old. Mark is a massive fan of Formula One racing. Interestingly, Jannik Sinner has an elder brother whom his parents named Mark Sinner. However, a lesser-known fact that has been stayed away from the public is the fact that he is adopted. Mark originally hails from Russia and came to Italy 25 years ago.
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Last Updated: April 2, 2026
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