Sebastian Munoz made PGA Tour history by shooting his second 60 of the season at the AT&T Byron Nelson on Thursday.
World number 73 Munoz became the first PGA Tour player with two rounds of 60 or better in the same season by going 12-under par at TPC Craig Ranch.
It followed the Colombian's 10-under 60 in the opening round of the RSM Classic at Sea Island Resort last November. On that occasion he finished third.
After bogeying the par-four eighth to slip to two under, Munoz gained six shots across the next four holes – eagles at nine and 12 for the second straight year sandwiching consecutive birdies.
Munoz added birdies at 14, 16 and 17 before recovering from a wayward approach shot at the last by getting up and down for a further gain and a back nine of 28.
Despite heading to the clubhouse with a comfortable lead, Munoz was disappointed not to have gone under 60 for the first time in his career.
Asked what he was thinking while stood on the 18th fairway, he replied: "59. Yeah. I wanted to give myself a chance.
"I think it was 250 [yards] to the pin into the wind. I kind of wanted to hit like a bullet, like a little draw. I knew if I want to hit it close it had to be a fady, soft-landed shot; I tried to do that. Overdid it and ended up with a 60, which is really good around here.
"It's a great feeling whenever everything is clicking, hitting the tee shots, ball is coming out in the window that you imagined, you're reading good the putts well. When everything is going it's just stay out of the way and just kind of let it happen.
"So that's what I did. I had a tough putt on 12 for eagle and like I was thinking like, it's okay if I don't make this one. Then it was like, I know I can make it, just kind of stay in it, trust what you're doing ... I made it.
"Yeah, coming in it was a great stretch and [I'm] really happy."