The decision to allow some of the world's top tennis stars to quarantine and play in Adelaide has paid a "huge dividend" for South Australia, Premier Steven Marshall says.
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The players, including Novak Djokovic, Rafael Nadal, Serena Williams and Naomi Osaka have spent the past 14 days in hotel isolation in SA, but have been allowed out to train.
They were released from those restrictions on Friday, in time to compete in a one-day exhibition tournament at Memorial Drive ahead of the Australian Open.
Mr Marshall said while the players were delighted to get out of quarantine, they appreciated the work done by SA Health and local police to make the experience as easy as possible.
"I think we've left a very, very good impression in their minds," he said.
"This has paid a huge dividend with these players now becoming unofficial ambassadors for our state with social media going out around the world."
Mr Marshall said South Australia also remained on track to lift its border restrictions for people from Greater Sydney from Sunday.
Under the current rules, people from Greater Sydney, the Central Coast and Wollongong are not allowed to come to SA.
Those measures have been in place since the COVID-19 outbreak in the city's northern beaches area.
From Sunday, those people will be free to come to South Australia and won't need to quarantine.
However, they will need to get tested for the virus on days one, five and 12.
"At this stage, we're on track to be opening up to Sydney," Mr Marshall said.
"We've had this dislocation between Sydney and Adelaide for quite some time and I know there will be lots of people looking forward to reuniting and coming to South Australia very soon."
Both SA and NSW reported no new locally acquired virus cases on Friday.
SA also has no active infections.
Australian Associated Press