Charlie Beljan climbed out of a hospital bed to maintain his lead in the Children's Miracle Network Classic in Florida.
The 28-year-old American, who was taken away on a stretcher on Friday evening after a second round 64 gave him a three-shot halfway lead, returned to the Magnolia Course on Saturday to card a third round 71.
And that was enough to give him a two-shot lead over Charlie Wi, Brian Gay and Josh Teater heading into the final round of the PGA Tour's final event.
Beljan, who had suffered breathing problems, an increased heart rate, high blood pressure and numbness in his arms in Friday's round, was given the all-clear by doctors after what the player believed was a sustained panic or anxiety attack.
After getting just one hour's sleep in hospital overnight, it came as no real surprise when he made a poor start to the third round with two bogeys in his first three holes.
But, despite looking a little unsteady as he walked the first few holes, the American perked up as the round went on and played his final 16 holes in three-under to post 13-under and take a two-shot lead.
Wi shared the lead with Beljan standing on the 16th tee but bogeyed the final two holes while Gay, who briefly led on his own, also dropped back to 11-under after bogeys at 16 and 17.
There is a seven-way tie for fifth and that includes Swedish pair Henrik Stenson and Daniel Chopra and four-time runner-up this season Robert Garrigus.
Beljan entered the season-closer in 139th place on the US Money List. Only the top 125 keep their cards for next season, hence his desire to carry on playing despite the health scare.