DOHA: Jakub Mensik caused a major upset in the Qatar Open when the 20-year-old stunned World No. 2 Jannik Sinner in the quarterfinal of the ATP 500 event.
Mensik beat Sinner 7-6(3), 2-6, 6-3 for the biggest win of his career by ATP ranking.
Two years ago, the Czech notched his maiden Top 5 victory against Andrey Rublev during his breakout run to the championship match in Doha.
The 2025 Miami champion Mensik is now 4-2 against Top 5 opponents, a tally that includes victories against ATP No. 1 Club members Novak Djokovic and Sinner, and he is up three spots to No. 13 in the ATP Live Rankings as a result of his exploits in Doha so far, ATP reports.