In best-ball format, the most important thing was those moments came on different holes.

Reavie and Glover teamed to shoot a 12-under 60 for a share of the Zurich Classic lead with China's Zhang Xinjun and Dou Zecheng.

Matt Jones teamed with America's Chad Campbell to be three strokes off the lead after a nine-under par 63.

All-Australian pairing of Jason Day and Ryan Ruffles sit a shot further back in a tie for 11th.

Reavie and Glover each had six birdies in the best-ball format, pushing through soggy weather early in the round before conditions cleared at TPC Louisiana. Six teams are two shots back in a tie for third after shooting 62.

"We were just rolling," Reavie said. "I think we're comfortable. We like to laugh and have a good time when we're playing golf, and it definitely helps."

Zhang and Dou birdied four of their final five holes. Dou made a 31-foot putt on No.9 to cap the impressive rally and jump into the lead with Reavie and Glover.

Day and Ruffels opened with an eight-under 64 to sit in a tie for 11th. PHOTO: Chris Graythen/Getty Images.

It's the first time since last year's Tour Championship that the reigning champs of all four majors have been in the same field.

None of them were among the leaders after the first round.

Masters champion Patrick Reed and Patrick Cantlay had a 65, and Open Champion Jordan Spieth and Ryan Palmer were at 66.

"I didn't feel like there was really any rust," Reed said.

"I felt like I hit the ball alright today. I felt I hit some good quality putts. A couple of them went in, a couple of them didn't."

This is the second year that two-player teams have competed at the Zurich Classic.

The unusual tournament features best-ball play in the first and third rounds and alternate shot in the second and final rounds.

US Open champion Brooks Koepka and Marc Turnesa shot a 67.

US PGA Championship winner Justin Thomas and Bud Cauley shot a 70.

There are 80 teams in the tournament and the top 35, along with ties, will make the cut after Friday's second round.