WTA chief Steve Simon said Monday the organisation maintained concern for the wellbeing of Peng Shuai after the Chinese tennis player issued a further denial of sexual assault allegations. Peng's fate has been shrouded in mystery since she alleged on social media in November that former Chinese vice-premier Zhang Gaoli forced her into sex during a years-long relationship. The post was deleted and Peng's whereabouts were unknown for three weeks, drawing worldwide concern for her safety. She has subsequently appeared at a handful of public events, and denies ever making the accusation against Zhang.