Fuzzy Zoeller came from five shots off the pace with a surging 67, swept past Jerry McGee and established a two-stroke lead today in the third round of the $250,000 Andy Williams-San Diego Open Golf Tournament.

Zoeller, winner of more than $100,000 last year but still seeking his first PGA Tour title, had a 54-hole total of 210, six shots under par on the 7,047-yard South course at the Torrey Pines Country Club.

"Winning is just a happening," said Zoeller. "It hasn't happened yet. Maybe this is the one."

He birdied four times in a stretch of five holes to take the lead, then stretched the advantage to two shots with a two-putt birdie 4 on the final hole.

McGee, the second-round leader, slipped to a 74 in the bright, sunny weather that bathed the cliffs and crags of the oceanside course. He takes a 212 total into Sunday's final round of the chase for a $45,000 first prize.

Veteran Billy Casper, 47, who had a hand in redesigning the South course a few years ago when he still made his home in San Diego, shot 69 while Gil Morgan and Bill Kratzert shot 72s to tie for third at 213.

First-round leader Tommy Aaron slid to a 75 and fell into a tie at 214 with six others, including Lee Trevino, who shot 70 today.

Tom Watson, the 1978 Player of the Year after winning five titles, had a 72 for even-par 216. The San Diego Open is his first competition in more than two months.