Padraig Harrington was one shot behind and warming up on the range. Vijay Singh was four shots back in the group behind.
Things sure can change in a hurry at Quail Hollow.
On a day when the steamy South felt more like late fall in New England, the leaderboard shifted just as suddenly. Within a half-hour, Woods and Singh were tied for the lead to set up a showdown between the top two players on the PGA Tour this year.
Woods missed his short birdie putt, then took his only bogey of the round when he drove into the trees on No. 9 and had to settle for a 4-under 68. Singh played the final three holes in 3 under to salvage a 71 and join Woods at 6-under 138.
Also tied for the lead was Arron Oberholser, who also emerged from obscurity quickly with birdies on his last three holes for a 69. They had a one-shot lead over Ted Purdy (69) and Jason Bohn (72), who were among six players who had at least a share of the lead. Phil Mickelson was three strokes back after a 71.
BROKEN ARROW, Okla. - Nicole Castrale shot a 4-under 67 in muddy conditions to take the first-round lead in the SemGroup Championship.
In search of her first LPGA Tour win, Castrale had the only bogey-free round of the day to take a one-stroke edge over Brandie Burton, Angela Stanford and former Oklahoma State star Karin Sjodin.
The 28-year-old former Southern California player had 20 players within three strokes of her on the leaderboard, including top-ranked Lorena Ochoa, Kraft Nabisco champion Morgan Pressel, Paula Creamer and Se Ri Pak.
LAKEWAY, Texas - Leonard Thompson shot a tournament-record 8-under 64 to take two-stroke lead in the FedEx Kinko's Classic, making the 60- year-old player the Champions Tour's oldest first-round leader of the year.
Loren Roberts, making his first appearance at the tournament, opened with a 66. He was tied with Japan's Massy Kuramoto.