Scottie Scheffler finished fourth in this year's PGA Championship
The American Scottie Scheffler became just the 12th player to shoot under 60 on the PGA Tour with a 12-under-par 59 in the second round from the Northern Trust.
Scheffler, 24, carded 12 birdies in a bogey-free round to reach 13 under overall in Boston, Massachusetts.
"You don't get too many chances to shoot a 59, so it's really cool to get the job done," said Scheffler.
Dustin Johnson was 11 under after 11 holes but cut the last seven holes to shoot 60 and 15 under.
The world number four had two eagles and five birdies in its opening eight holes to reach the turn in nine-under-par 27 and two more birdies followed on the 10th and 11th holes.
If he had picked up another birdie in his last seven holes, it would have been the first time that two players had hit sub-60 rounds in the same tournament.
Jim Furyk holds the record for the lowest lap in PGA Tour history after shooting 58 at the 2016 Travelers Championship.
It was the lowest lap in Johnson & # 39; s career. “I got off to a great start,” he said on Sky Sports. "You sure think about shooting 59, but I was just trying to play one shot at a time.
" It is what it is, it didn't happen. But I'm still happy with how I played and my position over the weekend. "
He leads Scheffler and Australian Cameron Davis (65) with two shots.
Scheffler reached the turn in 30 shots and hit five birdies from the 10th to the 16th, making him the par-5 18th birdie to hit 59 and he two-putted from 80 feet to reach the feat.
"I was decidedly nervous, very nervous about both putts at 18 and going down the track, but I think it helped me focus a little bit more, "he added.
Scheffler , who broke the track record by two strokes, is the second youngest player to hit 59 on the PGA Tour after Justin Thomas did so in 2017 at the age of 23.
Tommy England's Fleetwood hit a two-under round of 69 and moved to seven under overall, while fellow countryman Paul Casey also hit a 69 to go to three. below.
The Northern Trust is the first of three events in the FedEx Cup playoffs of the US Tour that will determine the PGA Tour champion for this season.