Tiger Woods has sent fans into a frenzy midway through day one at the BMW Championship, blitzing his way into the outright lead at Philadelphia's Aronimink Golf Club.
On a scorching hot Pennsylvania day with temperatures reaching 38 degrees and 51 per cent humidity, Woods has bagged five birdies and an eagle to rocket to seven-under-par through 10 holes.
Woods, a five-time winner of the BMW, currently holds a three-shot lead over a host of players at four under including world No.3 Justin Thomas.
The 14-time major winner jumped out of the gates after teeing off the 10th hole.
Three birdies in his first four holes preceded a stunning second shot from 242 yards into the par-5 16th hole.
He drained the five-foot eagle putt and then added birdies at the 18th (his ninth) and first to have the par-72 Aronimink's course record of 62 under threat.
Meanwhile, the Australian contingent is well behind on day one.
Former BMW winner Jason Day is the leading Australian at even par and seven shots back of Woods, while Cameron Smith is a further stroke behind.
Marc Leishman has started his title defence in poor fashion, dropping three shots through five holes.
Adam Scott is also struggling at five over through 11 holes.
The BMW Championship is the third event of the $US67 million FedEx Cup playoffs