American pair Jordan Spieth and Ryan Palmer teamed up to earn a share of a one-stroke lead at the new-look Zurich Classic of New Orleans.
This year's Zurich Classic at TPC Louisiana has a different feel, featuring a team-play format for the first time at the tournament.
The 72-hole event includes foursomes (alternate shot) during the first and third rounds and four-ball (best ball) throughout the second and fourth rounds in New Orleans.
Thursday's opening round saw Spieth and Palmer card a six-under-par 66 to be top of the leaderboard alongside Kyle Stanley and Ryan Ruffels.
Rotating tee shots in foursomes, two-time major champion Spieth and Palmer only holed two birdies on the front nine before picking up four shots following the turn.
Stanley and 18-year-old Australian team-mate Ruffels had eight birdies to go with two bogeys, having birdied four successive holes to start their day.
K.J. Choi/Charlie Wi, Ben Martin/Ben Crane, Jonas Blixt/Cameron Smith and Charley Hoffman/Nick Watney are a shot off the pace in a tie for third.
Hoffman and Watney eagled their final hole of the day to ensure they head into the second round five under overall.
Former world number one Jason Day and Rickie Fowler ended the day five shots behind the two leading teams.
An opening-round 71 left Day and Fowler level among 10 other teams.