Pebble Beach, Calif. ? Arron Oberholser shot a 6-under 66 on Saturday at Pebble Beach for a share of the third-round lead with former Masters champion Mike Weir in the Pebble Beach National Pro-Am.

Oberholser built his lead with a 20-foot birdie on the par-3 seventh that juts into the Pacific, then hit a 5-iron over the cliff to 25 feet below the cup for a birdie on No. 8. Two years ago, Oberholser was tied for the lead with Vijay Singh going into the final round and shot 76.

Weir played at Spyglass Hill, where light fog sifted across fairways and made the temperatures feel even cooler. The Canadian standout overcame a sluggish start and settled himself with a par save from a bunker on No. 6, then played bogey-free the rest of the way and finished with a birdie for a 69.

They were at 17-under 199, six shots clear of Luke Donald, who had a 71 at Poppy Hills.