Jakub Mensik of Czech Republic returns a shot from Jack Draper of Great Britain during their match at Hard Rock Stadium on March 22, 2025 in Miami Gardens, Florida. AFP
Fils had enjoyed one of the biggest wins of his career on Wednesday when he defeated top-seed Alexander Zverev but he struggled to repeat the feat against the impressive 19-year-old Mensik.
The towering Czech's big serve was too much for Fils after a first set in which the Frenchman fought back only to lose the tie-break.
Mensik moves into his first Masters 1000 series semi-final and he will face the winner of the quarter-final between Taylor Fritz and Matteo Berrettini later on Thursday.
In the remaining quarter-final, postponed from Wednesday, fourth-seed Novak Djokovic takes on American Sebastian Korda with the winner up against Bulgarian Grigor Dimitrov.
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