Marc Leishman and Cameron Smith claimed the Zurich Classic of New Orleans after defeating Louis Oosthuizen and Charl Schwartzel in a play-off.
Leishman and Smith, who carded a final-round 70, won the first play-off hole to trump Oosthuizen and Schwartzel in the race for the title on Sunday.
Australian pair Leishman and Smith and South Africa's Oosthuizen-Schwartzel pairing (71) finished level at 20 under par through 72 holes, a shot clear of Americans Richy Werenski and Peter Uihlein (67).
The final round was the second foursome format of the tournament, after Thursday and Saturday's rounds used alternate-shot play at TPC Louisiana.
Smith and Leishman soared to the top of the leaderboard thanks to 12 holes of flawless golf, which featured four birdies, before three bogeys in five holes allowed Oosthuizen-Schwartzel to join them at the summit.
Leishman's birdie chip at the 16th hole tied the South Africans as the two teams headed for a play-off – the first play-off in the team format of the event since former Masters runner-up Smith and Jonas Blixt prevailed in 2017.
Defending champions Jon Rahm and Ryan Palmer (70) finished 17 under overall, Xander Schauffele-Patrick Cantlay (67) and Henrik Stenson-Justin Rose (70) were two shots further back, while Tony Finau and Cameron Champ crashed down the leaderboard from joint-second to 17th place following their 76.
Schauffele and Cantlay combined for eight birdies and claimed a share of 11th place – tying the record for most par-breakers in a foursomes round at the tournament since it became a team event.