Kevin Sutherland shot a 10-under 62 to take a four-stroke lead over Rocco Mediate and Joel Kribel after the first round of the Callaway Golf Pebble Beach Invitational on Thursday.
Sutherland, the runner-up this year in the US PGA Tour's AT&T Pebble Beach National Pro-Am, had eight birdies and an eagle on the Del Monte Golf Course.
Mediate also played at Del Monte. He won the Callaway event in 1999.
Kribel, a former US PGA Tour regular who won the Monterey Open last month, opened at Pebble Beach. Craig Barlow and Tom Byrum shot 67s at Del Monte.
Leta Lindley shot a 68 at Del Monte, the lowest among seven US LPGA Tour entrants.
Tommy Armour III's 68 was the low round at Spyglass Hill.
The top 32 pros and ties and top 10 amateur teams will advance to the final round at Pebble Beach.