Tony Finau and Cameron Champ posted a four-under-par 68 in alternate-shot play for a share of the Zurich Classic of New Orleans lead following the second round.
After the opening round consisted of four-ball play at the longstanding PGA Tour tournament, which turned into a team event in 2017, day two switched to the foursomes format.
American pair Finau and Champ head into the weekend 13 under through 36 holes, two strokes clear alongside Norwegian duo Viktor Hovland and Kris Ventura, who were tied for the lead after day one.
Hovland and Ventura posted a 69 on Friday to stay atop the leaderboard at TPC Louisiana.
"I know we're having a good time with this format up to this point," Finau said. "We've both played some really solid golf, and we find ourselves at the top of the leaderboard.
"We'll do what we've been doing the last couple days, which is enjoy each other's company and not add any bonus pressure when it comes to team-mate golf."
Justin Rose-Henrik Stenson and Bubba Watson-Scottie Scheffler are 11 under at the halfway stage of the tournament.
Defending champions Jon Rahm and Ryan Palmer recorded a two-under-par 71 to be five shots behind.
Meanwhile, Graeme McDowell – playing alongside Matt Wallace – aced the 217-yard 17th hole to finish the day with a 70.