FILE - Peng Shuai of China returns a ball during the semifinal match against Shahar Peer of Israel, unseen, in the Guangzhou WTA Tour in Guangzhou in south China's Guangdong province Saturday, Sept. 19, 2009. An email purportedly from Chinese professional tennis player Shuai that a Chinese state media outlet posted on Twitter has increased concerns about her safety as the sport's biggest stars and others abroad call for information about her well-being and whereabouts since her accusation about two weeks ago that she was sexually assaulted by a former top government official. (AP Photo, File)

FILE - WTA Chief Executive Officer Steve Simon smiles during a retirement ceremony for Martina Hingis in Singapore on Oct. 29, 2017. An email purportedly from a Chinese professional tennis player that a Chinese state media outlet posted on Twitter has increased concerns about her safety as the sport's biggest stars and others abroad call for information about her well-being and whereabouts. Simon, the chairman and CEO of the Women's Tennis Association, questioned the authenticity of the email intended for him, in which Grand Slam doubles champion Peng Shuai says she is safe and that the assault allegation is untrue. (AP Photo/Yong Teck Lim, File)

FILE - Then Chinese Vice Premier Zhang Gaoli is seen during a meeting at the Great Hall of the People in Beijing, China, Wednesday, March 16, 2016. Chinese authorities have squelched virtually all online discussion of sexual assault accusations apparently made by a Chinese professional tennis star against the former top government official, showing how sensitive the ruling Communist Party is to such charges. (AP Photo/Ng Han Guan, File)