Potter shot three under in the final round to finish at 17 under for the tournament. It was a long time coming for the feisty lefty who battled his way back to the PGA Tour after suffering an injury in 2014 that caused him to miss almost two years of competition.
"It is pleasing", Potter said.
Potter was chasing history at the par-71 Monterey Peninsula layout, where he teed off on 10 and played his first seven holes in seven under par with five birdies and an eagle.Potter added four more birdies after the turn to seize the solo lead and take his total for the round to 11-under.
He'll be in the hunt along with Johnson - who opened 2018 with a dominant victory in the Tournament of Champions last month - and former world number one Jason Day of Australia.Day, victor at Torrey Pines two weeks ago, had six birdies in a three-under par 69 at Pebble Beach for a 12-under total of 203.
"My game is in pretty good form and I have a golf course I really like playing next week", he said. "I get my second career win after five years away from it". "Going back to the Masters, it'll definitely be another dream come true".
Paul George scores 29 points with 9 rebounds for short-handed Thunder
After a slow start, Walton got his answer. "I don't know if whether I'm going to LA, or what I'm going to do this offseason". George started strong with 12 points in the opening 6:52, hitting his first five shots including three 3-pointers.
But he stormed back with four birdies in the next six holes to jump clear and was never overtaken thereafter en route to an authoritative three-under-par 69 in fine conditions at Pebble Beach. Next week he'll defend his title at the Northern Trust Open at Riviera.
"I felt like I played OK", Johnson said.
Mickelson, Day and last week's runner-up at TPC Scottsdale Chez Reavie also finished at 14-under.
The Australian had an up and down Sunday round, but back-to-back birdies on the 15th and 16th moved him into a tie for second.
American Kevin Streelman (68) finished alone in sixth and Scott Stallings (66) was seventh at 12-under 275, five shots adrift of Potter.