Given the current playing conditions, and general toughness of the course, did Billy Horschel just shoot one of the best rounds (say, top 10)in US Open history? He shot 67, hit all 18 greens, and has the best round of the day so far by three strokes.
I'll concede Miller's 63 at Oakmont, Jack and Weiskopf's 63s at Baltusrol, and.....
It may have been better than Graham's 67 in the last round at Merion in 1981.