Jason Day and Jason Scrivener have upstaged their fellow Australians and defending champions Cam Smith and Marc Leishman in the second round of the Zurich Classic of New Orleans.
Day and Scrivener combined to shoot the equal low round of Friday's foursomes play at windswept TPC of Louisiana, a sparkling seven-under 65 that included an eagle and seven birdies.
It matched the tournament record for the alternate shot format, in which teammates take turns hitting shots to complete each hole.
A 12-foot eagle putt on the par-5 7th helped Day and Scrivener along, and they were on track for a 64 before bogeying the par-4 17th.
"I feel like we're gelling really, really well together on the greens and we're very similar in regards to how we read the putt and how we like to see the putt go in the hole, so that helps a lot," Day said.
"Today was special. I think we played some really phenomenal golf out there, especially with how the weather was."
Former World No.1 Day, who hasn't won since May 2018, and Scrivener, who mainly plays on the DP World Tour and would emulate Smith by winning his maiden PGA Tour title at the unique teams event, jumped 22 places to be tied for sixth at the half-way mark at 14-under.
Smith and Leishman were part of an eight-way tie for eighth at 11-under courtesy of a six-birdie round of 68.
All teams are chasing Patrick Cantlay and Xander Schauffele, who backed up their tournament record best-ball opening round of 59 with a 68.
"Today was special. I think we played some really phenomenal golf out there, especially with how the weather was." - Jason Day.
They were at an event-record 17-under, with only one bogey through 36 holes.
Ryder Cup and Presidents Cup partners Cantlay and Schauffele, starting on the back nine, birdied three of the first four holes to offset a bogey on the par-4 12th and added two birdies on their back nine.
"It was definitely more difficult playing alternate shot," Cantlay said.
The teams of David Lipsky-Aaron Rai and Doc Redman-Sam Ryder were second after 67s – all four of those players are seeking their first PGA Tour victory.
Cameron Tringale-Wyndham Clark (67) and the South African duo of Brandon Grace and Garrick Higgo (65) were next best at 15-under.
Top-ranked Masters champion Scottie Scheffler and Ryan Palmer settled for an even-par 72 to make the cut on the number at eight-under.
The father-son team of Jay Haas and Bill Haas also made the cut on the number, with a five-foot putt par on the last enough for a 71.
At 68 years, four months and 20 days, Jay Haas is the oldest player in history to make a PGA Tour cut.
The format shifts back to the best-ball on Saturday with the final round on Sunday reverting to alternate shot.