An eight-under-par round of 63 saw Charley Hoffman vault to the top of the Deutsche Bank Championship leaderboard after Saturday's second round.
The 2010 winner sits on 12-under after 36 holes, and holds a three-shot lead over first-round leader Brendon de Jonge. Zach Johnson, Rickie Fowler, Kevin Chappell, and Matt Jones are a further stroke back.
World number two Jordan Spieth missed the cut for the second round in succession after slumping to a second-round 74 to miss the cut mark by three strokes.
De Jonge had begun the day with a two-shot lead, but he was soon surpassed by Hoffman who made light work of the TPC Boston course during a round that included nine birdies and a solitary bogey at the par-three eighth hole.
The American, who started on the tenth tee, nearly grabbed a hole-in-one at the 11lth, and with eight birides in his first 14 holes, he soon found himself at the top of the standings. A bogey at the eight after missing the green to the right was soon undone by a birdie at the ninth to close out a round of 63.
After opening with a 65, De Jonge started strongly with a run of three birdies from the second to the fourth holes, before a birdie at the seventh was cancelled out by a bogey at the eighth. However, the Zimbabwean found scoring slightly tougher on the back nine, with six successive pars followed by a birdie at the 17th and a bogey at 18.
Zach Johnson was one of the big movers on the day, with the Open winner's 65 seeing him move up to eight-under where he is joined by Fowler (67), Jones (67), and Chappell (67).
Scotland's Russell Knox matched Johnson's 65 to climb to seven-under and a share of seventh with Sean O'Hair (67) and Henrik Stenson (68).
World number one Rory McIlroy shot a 74 to sit in a tie for 59th on two-over. But while the Ulsterman has struggled to make his mark at TPC Boston, Spieth's tournament is finished after following up his opening 75 with a 73.
Brooks Koepka is looking to win a historic third successive title at the event.
Andrew Coltart reckons if the Ryder Cup can go ahead, it should go ahead.
Webb Simpson could hardly believe he emerged victorious after a “crazy day” at the RBC Heritage.
The American also won the Phoenix Open in February.
The Englishman shot eight-under 63 on day three of the event at Hilton Head, South Carolina.
McIlroy followed his second-round 65 with a five-under 66 to move to 10 under, three behind early clubhouse leader Joaquin Niemann.
Nick Watney became the first golfer to test positive for since the PGA Tour’s resumption.
Brooks Koepka is worried Nick Watney’s positive test could be a sign of things to come.
Rory McIlroy revealed he met with Nick Watney prior to positive Covid-19 test.
England’s Ian Poulter dropped from a share of the lead to equal-sixth place on Friday.