Australia's Jason Day and Marc Leishman carded a 16-under 56 to take a one-shot lead after the opening round of the QBE Shootout.
The three-day event in Florida started with the scramble format on Friday, with players picking the team's best shot and continuing from there.
Day and Leishman finished with 12 birdies and two eagles in a blemish-free round to take a narrow lead into Saturday's greensomes.
Defending champions Harris English and Matt Kuchar, who are seeking to win the tournament for a fourth time, join Corey Conners and Graeme McDowell one stroke further back.
All 12 teams shot 62 or lower, with Bubba Watson and LPGA Tour player Lexi Thompson on 13 under in joint-fourth, alongside Kevin Na and Jason Kokrak.
Six straight birdies to close give the Aussies the lead. pic.twitter.com/h7WbKv0H4U— PGA TOUR (@PGATOUR) December 10, 2021