Kazakh Alexander Bublik advanced to the last four of the Wimbledon warm-up Halle Open, when Italian fourth seed Jannik Sinner withdrew hurt in the second set on Friday.
Bublik won the first set 7-5 and was up 2-0 in the second when Sinner pulled out with a right leg injury.
The Italian had taken a medical timeout at the end of the first set. He received treatment from a physiotherapist and played, and lost, two more games before pulling out.
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Sinner, the 21-year-old world number nine, now faces a race against time to be fit for Wimbledon which starts in early July.
The match was the opening last-eight tie.
Zverev goes through
Bublik will meet Olympic gold medallist Alexander Zverev, who is through to the semifinals after defeating Chilean Nicolas Jarry on Friday.
The 26-year-old German, who made it to the semifinals of this year’s French Open, defeated Jarry in straight sets, 7-5, 6-3.
Zverev will play in the semis for the third time. The German previously made it to the final of the Halle tournament in 2016 and 2017, losing to 10-time winner Roger Federer on both occasions.
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