The WTA said at the time it would not return until someone from the tour could meet with Peng and her allegations were properly investigated.
Four years later, professional tennis resumes in China after WTA ends Peng Shuai boycott
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Simon has demanded a full investigation, and the WTA said it is prepared to pull tournaments out of the country if it doesn't get an appropriate response.
Doubts over China tennis star's email raise safety concerns
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