Charlotte, N.C. ? Tiger Woods finally had the lead to himself on a chilly Friday at the Wachovia Championship as he walked toward the eighth green, only two holes left in his second round and his ball six feet below the cup for another birdie.

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.