Adam Scott has Covid-19, the first Australian pro to be struck down by the virus.

In what at the very least represents a blow to his Masters chances, Scott today withdrew from the US PGA Tour's Zozo Championship after returning a positive test.

"While it's difficult news to receive - as I really looked forward to playing this week - my focus now is on recovery for the final stretch of the fall," Scott said in a statement.

There are three weeks of golf remaining before the Masters at Augusta National, where he was the champion in 2013.

Scott is the 12th player to test positive to Covid-19 since the PGA Tour resumed tournament play in June. World No. 1 Dustin Johnson is currently sidelined after he picked up the virus, as is Tony Finau.

Under the tour protocols, Scott will be required to self-isolate for 10 days before returning to play, and will have to undergo tests for the virus for the next three months.