PGA Tour pro Jason Bohn has suffered a mild heart attack following the second round of the Honda Classic in Florida.
The 42-year-old complained of chest pains after his round on Friday and visited medical staff at the PGA National course.
He was then taken by ambulance to Palm Beach Gardens Medical Center where tests revealed a mild heart attack.
Bohn had fired a two-over-par round of 72 to make the cut but immediately withdrew from the event after experiencing chest pains soon after putting out on the 18th hole.
A two-time winner on the PGA Tour, Bohn is in a stable condition and will undergo further tests on Saturday.
Fellow PGA Tour player Tom Gillis tweeted: "Thoughts and prayers go out to Jason Bohn who had a heart attack this afternoon. Hang tough buddy."
Bohn, whose most recent PGA Tour victory came in 2010, is popular on the circuit and is often the playing partner of former Secretary of State Condoleezza Rice at the Pebble Beach Pro-Am.