Tyrrell Hatton, Sepp Straka, Will Gordon and Brice Garnett have withdrawn from this week's PGA Tour event, the Valspar Championship, after testing positive for COVID-19.
Gordon and Garnett withdrew on Monday, followed by Hatton and Straka on Tuesday.
Gordon and Garnett have been replaced in the field by J.J. Spaun and Tim Wilkinson, respectively. Hatton was replaced by Kiradech Aphibarnrat and Straka by Nelson Ledesma.
The players will self-isolate under CDC guidelines with the full support of the Tour. Gordon is currently 148th on the FedExCup standings, while Garnett is 113th, Straka is 88th and Hatton is eighth.
"Sadly I have had to withdraw this week from the Valspar Championship after testing positive for COVID-19 today," Hatton tweeted. "I will now be self isolating under the CDC guidelines. I wish everyone well this week and look forward to being back out on tour soon."