Australian Cameron Smith set a course record with a stunning 11-under-par 60 to claim a share of the lead alongside Jon Rahm at the Northern Trust on Saturday.
Smith missed a birdie putt on the 18th hole which would have seen him register a rare sub-60 score as well as taking the outright lead following a round which included 11 birdies at Liberty National Golf Course in New Jersey.
The missed 12-foot putt meant the 28-year-old Australian missed out on posting only the 13th sub-60 round in PGA Tour history.
"I actually thought it was going to kind of stay straight and then drop a little bit right there at the end off the bunker and just didn't do it," Smith said about his 18th hole putt.
"I haven't been in that situation before. It was completely new to me. I just tried to get up there and do what I did the rest of the day, hit a good drive, and my driver definitely put me in that spot today for all those birdies.
"It's been a bit of a rough trot with the driver of late. I felt like it's got away from me a little bit, and it was nice to see a lot of drives, a lot of good drives today."
Smith, who revealed he started to think posting 59 was realistic after he birdied the 14th hole, hit 11 of 14 fairways in his round.
He will resume in the equal lead with 2021 U.S. Open winner Rahm on Monday with Sunday's play postponed due to projected path of Tropical Storm Henri.
Rahm had been the outright leader heading into the third day, one stroke ahead of Tony Finau, but after four birdies on the front nine the Spaniard carded a third round four-under-par 67.
The 26-year-old was thwarted by a double bogey on the 13th hole, ending his bogey-free streak, along with a bogey on the 16th, before finishing with a birdie and a terrific par save.
Erik van Rooyen also stormed up the leaderboard with a nine-under-62 to move one shot behind the joint leaders. After bogeying the first, the South African posted 10 birdies in his round.
Justin Thomas and Finau are tied for fourth at 14 under, with Shane Lowry, Viktor Hovland and Tom Hoge a further stroke behind them.
Jordan Spieth was the major slider after carding a one-over-par 72 to drop to seven under overall, seven shots off the pace. Bryson DeChambeau also had a one-over round with four bogeys, to be five under.