Dustin Johnson takes control of the Northern Trust with a round of 60
The former US Open champion took just 27 shots for his first nine holes.
Boston tee party: Scottie Scheffler breaks 60 to join a select group
The 24-year-old from Texas carded 12 birdies and no bogeys in the Northern Trust.
Tommy Fleetwood drops from first to 12th in final two holes at Northern Trust
The Englishman dropped three shots on the 17th and 18th to close out the day five-under 66.