Well, Webb Simpson's claim to a share of the course record of 64 didn't last long.
Jason Dufner broke the course record of 64 at Oak Hill that Simpson had tied earlier in the day.
And Dufner himself tied a little bit of history by becoming just the 24th golfer ever to shoot a 63 in major championship history. It was a 63 that included five birdies, an amazing eagle and no bogeys.
It was an incredibly clean, locked-in round.
Here's his card:
Dufner is the first man to shoot 63 in a major since Steve Stricker did it at the 2011 PGA Championship.
Amazingly, Jason Sobel of Golf Channel even posited that some readers in his live blog did the calculation and noted that there have been roughly 150,000 rounds played in the history of golf majors and still nary a 62.
It is, however, the 12th 63 in PGA Championship history, the most of any major.
Dufner had his chance for a 62 at the 18th hole though but he left a 12-foot birdie putt well short as you can see in this video:
After his round, Dufner told TNT's Vince Cellini he was thinking about the 62.
"I showed a little bit of nerves there leaving it short at the end. The history of the game is something that's dear to my heart. It's great to be part of it. It kind of plays with your mind a little bit."
Dufner was incredible on a day when there was some pretty incredible play. It started out when he holed out on the second hole and never really stopped. It seemed like he had a reasonable birdie opportunity on nearly every hole.
He'll be the leader as we head to the weekend and likely your favorite for the next two days.
Dufner finished second in a playoff with Keegan Bradley at the PGA Championship just two years ago.