Stefanos Tsitsipas is into the semi-finals after Davidovich Fokina retired.
The Greek tennis player won the first set 7-5 after a hard fight, but immediately afterwards the Spaniard left the match as he was facing an injury problem.
Tsitsipas moved to the final four of the Monte Carlo Masters and is waiting to find out his opponent tomorrow.
Tomorrow's match is between the Belgian David Goffin and the Briton Daniel Evans, who made a big surprise yesterday by defeating Novak Djokovic.
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