Charlie Wi posted a bogey-free, three- stroke lead after three rounds of the Am.
Wi, who will go for his first PGA Tour win on Sunday, finished 54 holes at 15- under-par 199. He played his third round at Spyglass Hill.
Ken Duke shot five-under 65 at Monterey Peninsula to move into second place at minus-12.
Tiger Woods, who is making his first PGA Tour start of the year, carded a five-under 67 at Pebble Beach to move into third place at 11-under-par 203.
The three different courses were needed for the opening three rounds with amateurs involved in the event. The final round will be played at Pebble Beach.
Three-time champion Phil Mickelson, two-time winner Dustin Johnson, Kevin Na and last year's runner-up Hunter Mahan all had 70s on Saturday. They stand alongside Brendon Todd (69) in fourth place at minus-nine.
MORE TO FOLLOW.