Johnson, right, defeated Jordan Spieth in a playoff to the Northern Trust in 2017, losing a three-player playoff in 2015 -22 D Johnson (US); -17 H English (US), S Scheffler (US); -15 L Oosthuizen (SA); -14 D Berger (US), H Higgs (US), D Lee (Aus) Selected: -12 T Hatton ( Scary); -10 J Rahm (Spa); -7 J Thomas (US), P. Casey (Eng), J Rose (Eng), T Fleetwood (Eng), I Poulter (Eng); -1 T Woods (US); Even R McIlroy (NI) Full Ranking
Dustin Johnson produced a sensational last-hole eagle to round out a commanding five – shot lead on the way to the Northern Trust's final day.
The number four in the world ended a nice round by curling home a beautiful 12 meter high putt on 18th at TPC Boston.
It saw the 36-year follow-up to Friday's 60 with a seven-under third round 63 also with six birdies.
Johnson sits on 22 under, five ahead of Americans Harris English, who shot five under, and Scottie Scheffler.
It is the largest 54-hole lead on the PGA Tour this season. ]
Scheffler & # 39; s 59 on Friday made him just the 12th player to shoot under 60 on the PGA Tour.
In his third round, he shot a four-under-67, including a birdie on the 18th, but lost ground to leader Johnson of the night.
Tyrrell Hatton is the best placed British player, with the English world number 14 sitting 10 shots behind Johnson despite an excellent eight-under 63.
Spanish world number one Jon Rahm is 10 under.
Johnson will return to the world's number one with a win as Rahm and US number two in the world Justin Thomas – who is bottom seven – finish worse than a share of three in second place.
The Northern Trust in Norton, Massachusetts, is the first of three events in the FedEx Cup playoffs of the US circuit to be the PGA Tour champion for this season will determine.
Woods and McIlroy Boil
While Johnson continued his great form, Tiger Woods and Rory McIlroy both struggled in Saturday's third round.
Reigning Masters champion and 15-time great winner Woods is 68th after taking a two-over-73, one place above four-time great winner McIlroy, who won two triple-bogeys. away to 74.
The top 70 players in season points will advance to next week's BMW Championship, which will decide the 30 players to participate at the end of the season of Tour Championship next month at East Lake in Atlanta.
Both McIlroy, who started the week eighth on points, and Woods, 49th, will fall after poor displays in Boston.