A third flight into Melbourne has confirmed a positive Covid-19 test on arrival from Doha ahead of the Australian Open which starts on February 8.
It means another flight-load of people have been added to the 47 players and their entourages currently isolating for two weeks in their hotel rooms ahead of the first Grand Slam of the season. There are now 72 players in hard quarantine.
Those impacted cannot leave their rooms to train after infections were reported on Saturday on two chartered flights carrying them to the tournament's host city from Los Angeles and Abu Dhabi.
Australian Open
World number one Barty will not defend WTA Finals title
Other players who arrived in different planes are also undertaking a mandatory 14-day quarantine but are permitted to leave their hotels for five hours a day to train.
Australian Open tournament director Craig Tiley has confirmed the year's first Grand Slam will go ahead from February 8 despite anger from players forced into hard quarantine.
A broadcaster on the flight from Los Angeles had tested positive, adding to an aircrew member and a tennis coach on the same plane who were reported on Saturday.
The other case was Sylvain Bruneau, the coach of women's 2019 US Open champion Bianca Andreescu.
Bruneau was a passenger on a charter flight carrying 23 players from Abu Dhabi.

Tennis in 2020: Naomi Osaka, Iga Swiatek lead the way in unique season

Australian Open
'I liked what Novak said' - Medvedev backs Djokovic over vaccine being 'personal'
Australian Open
Raducanu preparing hectic schedule ahead of Australian Open debut