Blades Brown, 19, won the World Wide Technology Championship on Sunday. ESPN says he is the youngest PGA Tour winner since 1938.
He started the final round seven shots behind and shot a 9-under 63, the best round of the day.
Brown then beat Ben James with a birdie on the second playoff hole, after James missed a short putt.
At 19 years and 171 days, he is the youngest winner since Bobby Dunkelberger won the St. Augustine Pro-Amateur at 18.
The Associated Press counts it differently and says 95 years, going back to Charles Kocsis at the 1931 Michigan Open.
He is the first teenager to win on tour since Jordan Spieth took the 2013 John Deere Classic at 19 years and 352 days.
It was his first PGA Tour title, in only his 22nd start, at El Cardonal at Diamante in Los Cabos, Mexico.
Brown turned professional at 17, while still a junior in high school. He celebrated the winning putt with his father, Parke.
The win gives him a two-year exemption and a place in his first major, next year's PGA Championship.
Read the full Blades Brown report on Trends News Stories.
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