Injured Medvedev pulls out of Madrid Open quarter-final

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.