A lack of wind at Erin Hills, combined with greens softened by plentiful rain, has led to unusually low scoring throughout the week in Wisconsin.
"We're breaking down all kinds of barriers", Harman quipped. "It was downwind to where I knew if I hit it solid, I could definitely get it there". I've been there a handful of times and had some good finishes.
"Someone has a very good chance of ending up with their first major tomorrow", Fowler said.
"If somebody shoots nine under tomorrow in the top few (as Thomas did on Saturday) then I'll have to shoot 10, I guess".
"I'm going to enjoy my time tonight with my little girl and my wife".
South Korea's Kim Si Woo was one behind Fowler on nine under after also shooting 68, while three players - Patrick Reed, Russell Henley and Charley Hoffman were on eight under. All of the top 16 have never won a major championship.
Thomas poured that in to become the 29th player with a 63 in a major championship.
Harman, bidding to become the first left-hander to win a U.S. Open, is a victor on the PGA Tour this year while Thomas is the world number 13, a three-time victor this season and a member of the exclusive "59" club after breaking 60 at the Sony Open this year. And he kept right on going early in the third round, rolling in a 25-foot eagle putt on the par-5 fourth hole to reach 11-under par.
"Winning this event means a lot to me", Hardee said.
"I hope the moment will come as soon as possible. When I get it going, I don't fear it like I used to of stalling".
Reed climbed up the leaderboard with a 65, one day after signing for a 75.
Asked if achieving the latter feat was on his mind, the world number 50 replied: "No, I don't think that's a productive way to think about it".
Players are better now than they ever have been before, and that goes for all sports.
What we can nearly guarantee is that there will be a new Major victor crowned on Sunday evening, the nearest players to have won a Major to the leaders is Louis Oosthuizen and Sergio Garcia and they are eight shots back.