Japanese tennis star Naomi Osaka says she would be happy to quarantine for two weeks to play in the 2021 Tokyo Olympics but was wary that concerns remain among her compatriots about the safety of quarantining thousands of athletes and staff for the event. Osaka, the world No.3 and a three-time grand slam champion, was speaking days after the president of the International Olympic Committee insisted the Games would go ahead in Tokyo, despite reports it would be cancelled or postponed.