Jhonattan Vegas was the star as an incredible 11-under 60 saw him open up a six-shot lead at the Barbasol Championship.
The Venezuelan holed eight birdies, two eagles and just one bogey in a stunning display at the Robert Trent Jones Golf Trail in his second round on Friday.
Vegas finished the day at 17 under, six shots clear of American Hudson Swafford (63).
The 31-year-old Vegas started on the back nine and had an incredible run from 12 that went birdie-eagle-birdie-birdie-birdie-eagle, the last a hole-in-one.
"It was just incredible, to be honest. To the point where I almost thought I was sleeping," he said.
"Obviously you're trying to shoot as low as you can, but to have stretches like that, they're hard to imagine happening that often.
"It was just fun, I was enjoying the moment and it was good. I'm happy."
Vegas was eight under through nine holes in his second round before slowing down, falling just short of a 59.
Only six players have managed the magical figure on the PGA Tour, with Jim Furyk the last of those in 2013.
"I obviously thought about it, but I didn't really want it to get in my way," he said.
"I knew I had a lot of holes ahead and just didn't really want to let myself think that far.
"I just wanted to make as many birdies as I could and obviously one shot away from 59, but still pleased with a 60."
Michael Johnson (65) is third at 10 under, a shot ahead of Kyle Reifers (65), David Toms (66), Roberto Castro (66), Tim Herron (63), Andres Gonzales (65) and Chesson Hadley (66).