The 26-year old Reed was 125/1 to win the U.S. Open heading into Round 3 and while he has plenty of work to do sitting four shots back, the Superbook has improved his odds to 25/1.
Thirty-two players had sub-par rounds on Saturday, the most ever for the third round. Tied at 11-under with Thomas and in the second to last group are Brooks Koepka and Tommy Fleetwood. Vijay Singh was the last player to accomplish the feat in 2003 at Olympia Fields.
Thomas' 9-under round broke Johnny Miller's record for lowest score in relation to par.
Playing in the final group with Harman will be Thomas, who is almost as small but one of the longest hitters in the game. I don't know what else it was.
"Yeah, first cut made, too (at the U.S. Open)", Harman said.
Thomas says "I had no idea in terms of 9 under being the best in the U.S. Open".
But even with his historic round, Thomas, 11-under for the weekend, doesn't hold the lead.
"I was a little mad at myself because I could feel I was hungry on 14 (where he parred the par-five) and 15". Rickie Fowler ended the day with 68, just like Fleetwood and Koepka, to post at 10 under. It dropped him two shots off the lead and, to add insult to injury, it will still count as a three-putt. So I was very familiar with the Kettle Moraine land, what I'd call sinkhole kinda land, that didn't always drain - just a real unique, nearly Irish, Scottish look to it, gently rolling but it's like the glacier did some unique things to this land when it went through.More news: Long-driving Champ takes advantage of Erin Hills' generosity
None of the dozen have won a major, and neither have the four non-Americans (Fleetwood, Kim Si-woo, Bernd Wiesberger and Hideki Matsuyama). On typical U.S. Open greens, that would have run all the way off the back of the green.
Around 70 minutes earlier, compatriot Patrick Reed had faced a similar length putt to Thomas on the 18th to shoot eight under but missed his birdie attempt and had to settle for a 65.
Thomas, who first caught the attention of the golf world when he carded a bogey-free 65 at the 2009 Wyndham Championship as a 16-year-old, said the weather had played a key role in his round.
Then there was the Par-5 18th hole. This is the first time in 25 years that the U.S. Open has played as a par 72. "Hopefully I've got a lot of the bad stuff out of my system yesterday and some parts today".
Germany's Martin Kaymer, victor in 2014, took 41 shots to complete the front nine and although he picked up two birdies on the back nine, his three-over 75 saw him drop back to level par.
"It's been an off-week for me with the putting", said the former world number one.
Justin Thomas may have had one of the more entertaining birdies of the afternoon at the par-4 fifth.