Australian Open crowds capped at 50% capacity due to COVID-19

Crowds at the main Australian Open tennis stadiums will be capped at 50% capacity under updated COVID-19 restrictions, organisers said on Thursday, as authorities battle a surge of cases in Melbourne.

Face masks will also be mandatory for all patrons, except when eating or drinking, and there will be density limits of one person per two square metres at indoor hospitality venues.

Tennis Australia (TA) said the 50% cap only applied for ticket sales at the Rod Laver Arena centre court and the second show court Margaret Court Arena.

"There are no changes to ground pass access and we still expect to see strong crowds," TA executive Ben Slack said in a statement.

"We are confident in the 'COVIDSafe' measures we have in place."