NORTON, Mass. -- Earlier this season Phil Mickelson nearly shot his first 59 in a PGA TOUR event. He's threatening it again at TPC Boston.
Mickelson made seven birdies and no bogeys over his first nine holes to make the turn in 28 Friday morning.
Playing on the back nine here, he took just 10 putts and hit all but one fairway and one green in regulation. Spurred on by a hot putter, Mickelson made putts from 19, 28, 18, 15 and 11 feet, among others.
The course record at TPC Boston is 61, recorded by Mike Weir in the opening round of the 2008 event.
Mickelson also shot a 28 on the back nine in the second round of the 1997 Las Vegas Invitational and last year he carded a front-nine 29 at the AT&T Pebble Beach National Pro-Am, also in the second round.
29 front nine at 2012 AT&T Pebble Beach National Pro-Am during the second round
28 back nine at 1997 Las Vegas Invitational during the second round
This marks the second time this year the left-hander has threatened golf's magic number.
At the Waste Management Phoenix Open, he opened with a 60, narrowly missing a long birdie putt on his final hole. He went on to win by four.