Between 500 and 600 Australian Open players, officials and support staff will go into isolation after a worker at one of the event's quarantine hotels tested positive for coronavirus. Thursday's play at the six warm-up events at Melbourne Park has been cancelled as a result. But Victoria Premier Daniel Andrews said: "At this stage there is no impact on the tournament proper." Players will be free to return to competition after a negative test. "We will work with everyone involved to facilitate testing