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Story summary
- Lorenzo Musetti retired from China Open quarterfinal against Learner Tien due to left thigh injury, trailing 3-0.
- He had won the first set 6-4 before a medical timeout slowed his rhythm.
- Tien, ranked 52nd, reached his first ATP Tour semifinal and will face Daniil Medvedev; he is the youngest China Open semifinalist since Rafael Nadal in 2006.
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