PGA Tour stud Nick Watney was forced to withdraw from this week's RBC Heritage tournament after testing positive for COVID-19 ... officials announced Friday.
Watney, who played in the first day of the South Carolina tourney on Thursday, woke up feeling ill Friday ... and, according to PGA Tour reps, tested positive shortly after.
FYI, the Tour tested EVERYBODY prior to the start of the week's tournament ... with all results -- including Watney's -- coming back negative.
The Tour says Watney will now have to undergo strict quarantine and isolation rules to eventually return to action .