It was clear that Louis Oosthuizen came to play Sunday at the Deutsche Bank Championship after the South African earned himself a three-shot lead thanks to a nearly flawless round that included seven consecutive birdies.
Oosthuizen went 19 consecutive holes without missing a single green while establishing the new tournament records of most consecutive birdies, lowest front nine (29) and best score through the first 54 holes (-19).
Rory McIlroy had a solid -4 round of his own but was still forced to watch while his partner Oosthuizen ran away with the lead.
Tiger Woods and Dustin Johnson both remain in the thick of things in third place at -13 but they'll have to have a day like Oosthuizen had today if they're to pull off a miraculous tournament victory.
The final round of play begins early Monday morning. The complete standings for the tournament can be found here.
For news and updates throughout the holiday weekend at TPC Boston, stay with this StoryStream. For all your FedEx Cup and Ryder Cup news, visit SB Nation's golf hub.