The Olympics, overshadowed by diplomatic boycotts and concerns about Covid-19, will officially begin on Friday.
Peng Shuai alleged on social media in November that former Chinese vice-premier Zhang Gaoli forced her into sex during a long-term on-off relationship.
Beijing has not addressed the issue in any credible way after Peng Shuai accused a former government official of sexual assault, the Women's Tennis Association said.
Women's Tennis Association, WTA, calls for a full, fair and transparent investigation, without censorship, into Peng Shuai's allegation of sexual assault.
Chinese state media have released videos of Peng Shuai, whose whereabouts have been a matter of international concern for weeks, showing the tennis star appearing at a junior tournament in Beijing.
Tennis star Peng Shuai has not been seen or heard from publicly since early November when she accused a former vice-premier of sexually assaulting her.
A social media post by Peng accusing former vice premier Zhang of sexual assault, a claim that is yet to be verified, was quickly deleted and the Chinese tennis star has since disappeared from view.
Former world number one tennis player Peng Shuai accused former vice premier Zhang Gaoli of forcing her to have sex in a post since deleted and as yet unverified.
Serena Williams was relentless in her first appearance at Melbourne Park since winning the title in 2017, losing only five points in the opening set on her way to a 6-0, 6-2 win over Tatjana Maria in just 49 minutes.
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