Cameron Champ, a two-times winner on the PGA Tour, is the second known member of the circuit to test positive for the novel coronavirus following fellow American golfer Nick Watney's positive test last Friday.
World No 2 Rory McIlroy, back at the scene of his first PGA Tour win, fired a five-under 67 at Quail Hollow on Thursday for a seven-way share of the first-round lead in the Wells Fargo Championship in Charlotte, North Carolina.
Jeev Milkha Singh hopped back into contention after carding a roller-coaster four-under 68 in the penultimate round to grab a share of the third place at the $ 8.5 million World Golf Championships in Doral.
The Indian golfer completed a five-under-par 67 to be placed two strokes behind the leaders.
The MLS and NBA were paying particularly close attention to Friday's events as many of the positive tests occurred in Florida where both leagues have announced plans to restart their seasons at Orlando's Walt Disney World.