Bryson DeChambeau has tested positive for COVID-19 and will miss the Tokyo Olympics.
The world number six tested positive before leaving the United States for Japan.
Last year's US Open champion becomes the highest-profile athlete to test positive for the virus.
"I am deeply disappointed not to be able to compete in the Olympics for Team USA," DeChambeau said in a statement.
He will be replaced by Patrick Reed.
Reed, the 2018 Masters champion, is now the only two-time Olympian in the sport, which was reintroduced to the program in 2016.
Reed was scheduled to undergo testing on Sunday and Monday to clear himself to compete in Tokyo.
The first round of golf competition at the Games is set for Thursday at the Kasumigaseki Country Club.
Wires/ABC
