Nick Price shot a 2-under 70 on Friday and is alone in fourth place at 9-under-par 135.
Woods, the defending champion, needed only 11 putts on the front nine but tied for the lead for the first time in Friday's round at the 11th. He drained a four-foot birdie putt there and two holes later, Woods two-putted from 25 feet for another birdie.
Woods extended his lead at the par-5 16th after bombing his drive down the fairway but pushing his second shot into a greenside bunker. He blasted out to seven feet and converted the birdie putt to reach 10-under par for the tournament.
A good bit of fortune came Woods' way at the 17th. His 9-iron approach was headed left of the green but his ball took two hops out of the rough and rolled two feet from the hole where he notched his seventh birdie of the round.
'It was supposed to be a soft 9-iron,' said Woods. 'It was a soft nine with a flip hook, just came off the heel with left-to-right spin. Other than that, it was a great shot.'
Woods had a chance to break the course record at Sherwood Country Club but his approach on 18 stayed at the top of the hill instead of rolling down to the cup.
'Yesterday I played a sloppy round of golf, and today I cleaned it up,' said Woods, who opened with a 68 on Thursday.
Harrington bogeyed the final hole Friday to finish off a round of 69, while Love birdied the same hole to polish off his round of 68.
Phil Mickelson played with Woods on Friday and his round could not have been more different than Woods'. Mickelson shot a 2-over 74 in a round that included three provisionals, two rulings by officials and horrible time off the tee.
'I might have made a mistake playing in the off season,' said Mickelson, who shares 12th with Michael Campbell at 2-under par. 'I'm not playing well, and I'm having a hard time getting motivated to work on it.'
Mickelson traditionally takes time off at the end of the year but is playing quite a bit this off-season. His wife is expecting the couple's third child next March and Mickelson elected to play more at the end of this year and take time off at the beginning of next year.
Bernhard Langer matched Woods with a 65 on Friday and the German is tied for fifth at 7-under-par 137. David Toms, the 2001 PGA Champion, and Retief Goosen, the 2001 U.S. Open winner, joined Langer at minus 7.
Jim Furyk, the overnight leader, struggled to a 2-over 74 and shares eighth place with Colin Montgomerie. The duo's 36-hole total of 6-under-par 138 puts them five shots behind Woods.
Chris DiMarco is alone in 10th, followed by Mark O'Meara, who won last week's Skins Game. DiMarco is at 5-under par, while O'Meara stands at minus 3 after two rounds.
Vijay Singh is 14th at even-par, followed by Bob Estes, who is 3-over and Rich Beem. The reigning PGA Champion shot a second-round 77 and is at 7-over-par 151.
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