Czech Jiri Lehecka has progressed to the semi-finals of the Madrid Open after Daniil Medvedev had to quit the match with a groin problem following the loss of the first set.
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Third seed Medvedev requested a medical time out due while leading 3-2 in Thursday's last-eight encounter and continued to visibly struggle to move after coming back onto the court.
Lehecka, who knocked out Rafa Nadal in the last 16, then broke the Russian's serve to take a 4-5 lead and wrapped up the set 6-4 before Medvedev told the umpire he could not continue the match.
Lehecka will face Canada's Felix Auger-Aliassime in the semi-finals on Friday.
The 23-year-old Canadian was due to face top seed Jannik Sinner in the quarter-finals but the Italian also pulled out from the tournament with a right hip injury on Wednesday.
Russian seventh seed Andrey Rublev will play Taylor Fritz, seeded 12th, in the other semi-final on Friday.
Australian Associated Press
