Dustin Johnson has withdrawn from this week’s PGA Tour event, the CJ Cup at Shadow Creek in Las Vegas, after testing positive for COVID-19.

In a statement released by the tour on Wednesday, Johnson reported to tournament officials that he was experiencing COVID-19 symptoms. He was administered a test, with the positive result forcing Johnson to remove himself from the field.

“Obviously, I am very disappointed,” Johnson said in a statement. “I was really looking forward to competing this week, but will do everything I can to return as quickly as possible. I have already had a few calls with the tour’s medical team and appreciate all the support and guidance they have given me.”

The World No.1 had been on a tear. He won three times over the American summer, including his first FedEx Cup title, and finished T-6 in September’s US Open.

The news comes a week after Tony Finau had to withdraw from the Shriners Hospital for Children Open after testing COVID-19 positive. Johnson is the 12th player to have tested positive since the tour’s restart in June.

J.T. Poston will replace Johnson in the field.