There will be no Australian Open lead-up matches played at Melbourne Park on Thursday after a hotel quarantine worker from the Grand Hyatt tested positive to COVID-19. Victoria Premier Daniel Andrews said up to 600 people linked to the Australian open, including players and staff, have been classed as “casual contacts” with the quarantine worker and will need to be tested and self-isolate until they receive a negative test result. The positive COVID-19 case has put the remainder of the Melbourne Summer Series and ATP Cup tournaments in doubt, with the decision on whether Friday’s fixtures will go ahead to be made later on Thursday, officials said. Despite the positive test, Mr Andrews remained confident that the Australian Open, which is due to begin on February 8, will not be impacted.