Australian Open boss Craig Tiley says he is "absolutely confident" the Grand Slam will start as planned on Monday, despite 160 players waiting for the outcome of coronavirus tests.
Play at six warm-up events and the Slam draws were postponed on Thursday.
"We fully expect to keep the original schedule after today," said Tiley.
The warm-up events, which are all taking place at Melbourne Park, are set to resume on Friday. The Australian Open draws have been moved back to the same day at about 03:00 GMT.
The disruption came after it was announced on Wednesday that a 26-year-old man tested positive for Covid-19 after working at the Grand Hyatt hotel where the players affected were staying in a 14-day quarantine.