Woods is looking to win his first major of the year and 15th overall. While there are still two rounds left to play, the odds are on his side: He is 8-0 when he is the 36-hole leader at a major.
Woods is at 7-under. Playing partner and defending champion Padraig Harrington, U.S. Open winner Lucas Glover, Vijay Singh, Brendan Jones and Ross Fisher are all at 3-under.
Tied with Fisher with five holes to play, Woods took advantage of the shortened par-4 14th to start a run of three straight birdies that separated him from the pack.
Woods has four PGA titles, one fewer than Walter Hagen and Jack Nicklaus.