Serena Williams has told US TV host Stephen Colbert the quarantine rules ahead of the Australian Open are “super, super strict”, but said they were the right thing to do to control the COVID-19 pandemic.

“It’s insane and super intense but it’s super good, because, after that you can have a new normal like what we were used to last year this time in the United States,” she told the Late Show.

“They’re doing it right,” Williams, who travelled to Australia with her young daughter Olympia, said.

“Australia right now has, the last I heard, zero cases of COVID. So that is unbelievable, right, the whole country? That is really amazing.