Tour pros reacted in awe as after Justin Thomas eagled the 667-yard 18th hole to shoot the lowest round in relation to par in US Open history.
Thomas matched Johnny Miller's long-standing record of posting a 63 to join the club but, with Erin Hills being a par-72 course, his nine-under-par total meant it was a championship record.
It also broke the Erin Hills course record and helped give the American the clubhouse lead, before Brian Harman overtook him to lead by one heading into the final round.
But it was Thomas' combination of 3-wood, 3-wood, putt that sent his fellow tour pros wild, with Shane Lowry branding his second shot 'ridiculous' and Ross Fisher saying it was 'pure filth'. And with good reason.
✔️ 331 yard three wood— The European Tour (@EuropeanTour) June 17, 2017
✔️ 310 yard three wood
✔️ 10 foot putt
What a way to make history! pic.twitter.com/GDYTwUo4rj
That is pure filth from JT 👏🏻👏🏻👏🏻— Ross Fisher (@RossFisher) June 17, 2017
No better feeling in golf than standing over the ball & knowing you are going stripe every shot & hole every putt - great playing JT 👏🏼 #63— Luke Donald (@LukeDonald) June 17, 2017
That any good?? 👊🏽💪🏽 https://t.co/I9iWbsezoI— Smylie Kaufman (@SmylieKaufman10) June 17, 2017
Speaking about the challenge ahead tomorrow, Thomas said: "I feel comfortable when I get into contention but being in this situation in a major is new to me.
"I felt like I handled it pretty well today. I know it was Saturday, not Sunday, and I know I'll be teeing off late tomorrow but I'm excited. I hoped that this moment would come as soon as possible and the fact that's it's taken until now - it is what it is.
"I know I'm going to be nervous but I'm excited for the opportunity and I need to harness those nerves as best I can and go out there and have a good time."