Two strokes behind are Hunter Mahan and Ryan Palmer. Stunningly, Phil Mickelson is 6-over for today after 11 holes, and Tiger Woods' 18-over, 298 tourney finish is the worst of his career.
Updated at 3:10
Akron, Ohio -- Sean O'Hair has birdied two of his first five holes in the fourth round of the WGC-Bridgestone Invitational, putting him 11-under par for the tournament and holding a two-stroke lead.
Hunter Mahan, 3-under through six holes today, and Ryan Palmer, even-par after three, are at 9-under for the tournament on Firestone Country Club's famed South Course.
Matt Kuchar (through four holes) and Bo Van Pelt (through seven) are three strokes behind O'Hair at 8-under.
The most shocking events of the day involve the world's top two ranked golfers, Tiger Woods and Phil Mickelson.
Woods shot a 7-over par 77, finishing his tournament at 298, 18-over par. It's the worst showing in his professional career. He's in 79th place, ahead of only Henrik Stenson.
Mickelson would have replaced Woods at No. 1 if he had finished in the top four. That's not going to happen. Lefty is 6-over par in his first 10 holes, putting him at 1-over for the tournament.