However, neither Thomas and Fowler aren't the leader heading into Sunday's final round.
Leishman had raced up the leaderboard through his opening 10 holes before a double bogey at the par-four 12th hole saw him let slip a chance to catch the leaders.
ERIN, Wis. (AP) - Tommy Fleetwood had no problem picking out his best shot of the day.
Scheffler isn't the only amateur making waves at Erin Hills, with Cameron Champ two shots back of the lead at 5 under. Champ is 3 over in the final round with two holes to play.
Scheffler plays for the University of Texas, and Champ plays for Texas A&M.
"Taking nothing away from 9-under par - 9-under is incredible with U.S. Open pressure", Miller told GolfChannel.com.
Thomas poured in the eagle to become the 29th player with a 63 in a major championship.
Thomas mixed nine birdies and two bogeys before hitting his second shot to six feet on the par-five 18th hole and tapped in for eagle to record the lowest round (9-under) in relation to par in US Open history.
The first prize amount is the only figure that has officially been announced by the United States Golf Association, but with a 20 percent increase in the total purse as well as the champion's share, here are the projections for the U.S. Open finish as well as the estimates on the top-10 payouts.
Koepka birdied his first two holes to get to 13 under.
Rickie Fowler, on the verge of being left behind, rallied with three straight birdies and shot 68. His 1-over-73 left him in a tie for 51st at 2 over through 54 holes.
The 40-year-old Hoffman is playing in his sixth U.S. Open. Harman missed the cut in his previous two U.S. Opens. And instead of leaving Erin Hills fretting about how much better he could've done, he was thankful it wasn't any worse.
"It was a good bogey though", joked Fleetwood, who regained his composure to hit a superb pitch from well below the putting surface.
Harman was on top at 12 under coming into the day. He shot 68 and was only three back.
Stricker couldn't help but break into a wide smile when he made a 30-foot birdie putt on the 17th hole to get to 4 under for the day.
Three pars later, it was all over.
Oosthuizen, who finished second in the US Open in 2015 and lost a play-off for the Open a month later, had to settle for a 68 to finish four under par. Then again, Spieth has always said Ellie is the funniest member of the family.
Make it a six-way tie atop the U.S. Open leaderboard.
Justin Thomas may have had one of the more entertaining birdies of the afternoon at the par-4 fifth. He ends his weekend at Erin Hills at 1 over. There have been a pair of 65s, and Brian Harman holds the 54-hole lead at 12-under.