Alex and Matt Fitzpatrick made history by becoming the first brothers to win a PGA Tour event at the Zurich Classic of New Orleans pairs tournament.
The English brothers started the final round with a four-shot lead, having set a tournament record score on Saturday, but struggled to find their rhythm and had to endure a nervy finish.
A double bogey on the 12th was followed by a bogey on 14 which opened the door for Norwegian duo Kristoffer Reitan and Kristoffer Ventura and Americans Alex Smalley and Hayden Springer.
It was a three-way tie on 30 under par with two pairings in the clubhouse when the Fitzpatricks were left on the final hole.
But world number three Matt played a beautiful shot from the bunker to leave Alex a simple birdie putt from just a couple of yards to wrap up a historic victory at TPC Louisiana.
"It won't sink in," Alex said.
"It's amazing to be here with him, my mum and dad. It's a lot of hard work and I can't believe we've done it.
"It's as good as it gets."