The head of the Women's Tennis Association on Wednesday voiced doubt over an email it received, which was also released by a Chinese state media outlet, in which tennis player Peng Shuai was said to deny her previous allegations of sexual assault.
Peng, one of China's biggest sport stars, said on social media this month that former Chinese vice premier Zhang Gaoli coerced her into sex and that they later had an on-off consensual relationship.
Her post was deleted about half an hour later and she had not been seen publicly or made a statement since then, alarming the global tennis community.
On Twitter on Wednesday, Chinese state-affiliated media outlet CGTN released what it said was an email Peng had sent to WTA Chairman Steve Simon, who is also its CEO, in which she said the allegation of assault was untrue. Twitter is blocked in China.
"The statement released today by Chinese state media concerning Peng Shuai only raises my concerns as to her safety and whereabouts," Simon said in a written statement. "I have a hard time believing that Peng Shuai actually wrote the email we received or believes what is being attributed to her."
China's State Council Information Office and the Chinese Tennis Association did not immediately respond to a request for comment.
The email which CGTN attributes to Peng says: "I'm not missing, nor am I unsafe. I've just been resting at home and everything is fine."
Besides CGTN, the English-language arm of state broadcaster CCTV, no other Chinese media outlet as of Thursday morning in Asia had reported the letter.
A representative for Peng did not immediately respond to request for comment.
The government has yet to comment on Peng's initial allegation, and discussion of the topic has been blocked on China's heavily censored internet.
The WTA and the ATP previously called for China to investigate Peng's allegations, and players including Naomi Osaka and Jessica Pegula have expressed their support for her on social media with the hashtag #WhereIsPengShuai.
"The WTA and the rest of the world need independent and verifiable proof that she is safe," Simon wrote. "I have repeatedly tried to reach her via numerous forms of communications, to no avail."
The situation comes at an awkward time for China, which is preparing to host the Winter Olympics in Beijing in February, amid calls from global rights groups and others for a boycott over its human rights record.
Simon told the New York Times on Sunday that no one at the Tour has talked directly to Peng but that he had received assurances from the Chinese Tennis Association that she was safe "and not under any physical threat".
Peng, 35, was the first Chinese player to top the world rankings when she was doubles number one in 2014. She won doubles titles at Wimbledon in 2013 and the French Open in 2014.
Zhang, now 75, was a vice premier between 2013 and 2018 and served on the Politburo Standing Committee between 2012 and 2017.