* Mickelson birdied all but two holes on opening nine
* Woods sits five shots back of clubhouse leader
American Phil Mickelson grabbed the early clubhouse lead at the first round of the Deutsche Bank Championship on Friday after shooting an eight-under 63 at the TPC Boston.
Mickelson, who started on the 10th tee, shot a sizzling seven-under 28 over his opening nine holes and finished with a one-shot lead over compatriot Kevin Stadler in the second event of the lucrative FedExCup playoffs.
The British Open champion's hopes of a truly remarkable score were undone by bogeys on the first and last holes of his back nine, although an eagle at the par-five second ensured he did not undo much of his outstanding start.
Mickelson, the world number three, was grouped with Tiger Woods and Adam Scott, ranked first and second in the world, respectively, and he set the perfect tone with a 19-foot putt for birdie on his opening hole.
The left-hander birdied every hole on the back nine except the par-four 12th and 13th, producing pin-point iron shots and composed putting.
But Mickelson's round could easily have unraveled on his final hole, the par-four ninth, where he drove far right into the trees and clambered into the woods where he characteristically managed to blast the ball out to the rough.
From there, the left-hander found the green and two putted for a bogey.
Woods, the FedExCup points leader, mixed four birdies with a bogey for a three-under 68 while Australian Scott had three bogeys and a lone birdie for a disappointing two-over 73 on an ideal morning for low scoring.
Stadler took full advantage of those conditions with his seven-under 64 featuring just one bogey and eight birdies.