American Brandt Snedeker has fired a four-under par 68 to share the lead after the third round at the AT&T Pebble Beach Pro-Am.
The 32-year-old ended 54 holes at 12-under par and was joined there by fellow American James Hahn, who birdied his final three holes for a six-under 66.
Pros played alongside amateurs, many of them celebrities in entertainment and sports, over three courses during the first three rounds before the cut ahead of Sunday's finish at Pebble Beach.
Snedeker played his Saturday round at Pebble Beach, which will host the final round, while Hahn was at Spyglass Hill.
Chris Kirk fired a six-under 64 at the other course in the rotation, the Shore Course at Monterey Peninsula Country Club.
Kirk is in outright third at minus 11, while Patrick Reed posted a 67 at Monterey and is one shot back at 10-under par.
Richard H Lee shot 66 at Pebble Beach and ended three rounds alone in fifth place at nine under.
Retief Goosen had a three-under 67 at Monterey to finish 54 holes at eight-under par.
He was joined in sixth place by Robert Garrigus (66), James Driscoll (67), Jimmy Walker (67) and Jason Day (70), who all played at Pebble Beach on Saturday.
Defending champion Phil Mickelson put two balls in the water on the 18th at Pebble Beach.
He carded a one-over 73 and made the cut on the number at one-under par.