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CHANGZHOU, China, July 24 (Xinhua) -- China's Chen Yufei is set to face South Korea's world No. 1 An Se-young in the women's singles quarterfinals at the badminton China Open, after both shuttlers defeated respective rivals on Thursday. Tokyo Olympic champion Chen showed resilience, rallying from one game down to beat teammate Gao Fangjie 13-21, 21-5, 21-9. "We know each other very well, but a tournament