Tommy Fleetwood fired a stunning, historic 63 to set the clubhouse target and surge right into contention during the final round of the US Open at Shinnecock Hills Golf Club.
The reigning Race to Dubai champion began the day six shots off the lead but made eight birdies to get to two over and equal the lowest ever round at a US Open and the lowest ever score in the final round of a Major Championship.
Sunday was the 45th anniversary of Johnny Miller firing a 63 to win the US Open at Oakmont and if Fleetwood were to do the same, it would complete a remarkable turnaround for a player who needed a top ten in the final event of the 2012 season to keep his European Tour card.
The Englishman was the leader in clubhouse but defending champion Brooks Koepka was one shot ahead of him out on the course after turning in 33, with World Number One Dustin Johnson alongside Fleetwood having also played nine holes.
Masters Tournament champion Patrick Reed was three over after 11, a shot clear of fellow American Tony Finau.
After the controversy of Saturday when the lead moved back seven shots, the greens were watered and the pin positions were more inviting, with lower scoring looking a distinct possibility from the off.
Rickie Fowler had fired an 84 on day three but he proved that a charge through the field was possible, going 19 shots better with a 65 before any of the leading groups had teed off.
Fleetwood made a fast start with the putter, holing a 50-footer on the second and a 19-footer on the third to get to seven over. A stunning approach to the sixth set up another gain and a nice tee-shot into the next had him within two of the lead before he dropped a shot on the ninth.
His start paled in comparison to Reed, however, who was inside ten feet on the first, second and third to move into a share of the lead.
Koepka soon changed that, holing a 20-footer on the second to edge ahead at two over.
Fleetwood needed a response to that disappointment on the ninth and he holed another long putt on the 12th before leaving himself a tap-in on the next and he was two off the lead again.
Koepka had a short putt of his own on the third to re-establish his advantage but Fleetwood would not be shaken off as he holed another 20-footer from just off the front of the 14th green to join the group in second.
Reed then got up and down from the sand for a fourth gain of the day on the fifth but Fleetwood responded again, this time from 30 feet for a fourth birdie in a row.
It was blow-for-blow and Koepka and Johnson both birdied the fifth after getting on the green in two before Reed put a tee-shot to 13 feet on the seventh for yet another birdie.
Koepka showed the first chink in his armour with a tee-shot to the right on the sixth that led to a bogey as Fleetwood parred his way home to set the target.
Johnson missed the green at the seventh to drop a shot but regained it at the eighth, with Reed three-putting the ninth for a first bogey of the day and then missing the green on the 11th to fall two shots off the lead.
Finau had a roller coaster of a front nine with bogeys on the second, third, fourth and seventh, and birdies on the fifth, eighth and ninth.
Daniel Berger was five over, a shot clear of Tyrrell Hatton, Justin Rose and Xander Schauffele.