Daniil Medvedev retired from his quarterfinal against Jiri Lehecka because of an injury.

Medvedev retired after losing the first set 6-4, sending the 31st-ranked Lehecka into a semifinal against 35th-ranked Felix Auger-Aliassime.

Medvedev, the No. 4 in the world, needed treatment on his upper right leg while leading 3-2, complaining about having trouble moving to his right. He also needed treatment at 4-3, and after Lehecka broke serve in the ninth game to win the set, Medvedev decided not to continue.

"It's never easy in a match like this," Lehecka said of Medvedev’s retirement. "If I were to choose the way how to win this match, it wouldn't be like that. So of course, it’s never easy to see your opponent struggling, but at that moment, you just need to focus on yourself, trying to get the maximum level out of yourself."

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AP tennis: https://apnews.com/hub/tennis