Dustin Johnson overcame a sloppy back nine in the stiffening breeze by making a 10-foot birdie on the 18th hole at Pebble Beach for a 2-under 70 that gave him a share of the lead going into the final round of the AT&T Pebble Beach National Pro-Am in California.

Given the conditions, the 70 at Pebble Beach felt like hard work.

Ted Potter Jr. shot a 62 at Monterey Peninsula and left wondering how much better it could have been. Potter, with virtually no one watching his round because the stars were at Pebble on Saturday, was 11 under with three holes to play, needing only one birdie and two pars for a 59.

He bogeyed the last two holes, which at least was enough to tie for the lead.

“I didn’t feel like I hit bad shots coming in there on the last couple, making bogeys there, but I just knew it was going to be tough coming in,” Potter said.

They were at 14-under 201, and with more wind in the forecast — compared with virtually none the previous two days — this could be wide open.

Johnson is going for his second straight PGA Tour victory having won by 8 shots at Kapalua to start the year. He also is virtually assured of being only the fifth player since the world ranking began in 1986 to be No. 1 for an entire year.

Jason Day, coming off a playoff victory at Torrey Pines two weeks ago, had a 69 at Pebble Beach and was 2 shots behind along with Troy Merritt, who had the lead until four bogeys over his last six holes at Monterey Peninsula for a 69.

Jon Rahm birdied his last three holes at Spyglass Hill and worked his way back into contention with a 70. He was in a group at 11 under that included 50-year-old Steve Stricker (70) and Patrick Rodgers (69).

Also in the mix was Phil Mickelson, though he made it harder on himself with a three-putt bogey on the 18th at Pebble Beach for a 72. Mickelson had gone 46 consecutive holes without a bogey, though he managed only one birdie Saturday at Pebble Beach.

European Tour

Thailand’s Prom Meesawat took a 2-stroke lead after three rounds with a 5-under 67 while England’s Lee Westwood went from a tie for first place to being out of the World Super 6 tournament in Perth, Australia.

The Thai golfer had a three-round total of 12-under 204 at Lake Karrinyup Country Club, with three golfers tied for second: American Sean Crocker (67), Australian Lucas Herbert (69) and Denmark’s Thorbjorn Olesen (69).

Westwood shot a third-round 78 in the European Tour event to finish out of the top 24 that would have qualified him for match play on Sunday.

The event is sanctioned by three tours: European, Asian and PGA of Australia.

Champions Tour

Mark Calcavecchia birdied the last three holes Saturday to take a 2-stroke lead over Bernhard Langer into the final round of the PGA Tour Champions’ Boca Raton Championship in Florida.

Calcavecchia, 57, shot a 6-under 66 at The Old Course at Broken Sound, rebounding from bogeys on Nos. 14 and 15 with the late birdie run. He made a 25-footer on the par-4 17th and set up a 3-foot putt on the par-5 18th with a chip after leaving an approach from the right pine straw to the right of the green.

Langer, the 2010 winner in his home event, had his second straight 66. The 60-year-old German star won seven times last season, three of the victories majors.

Bart Bryant had a 64 to match Jerry Smith (67) at 10 under. Paul Broadhurst (66), Steve Flesch (68) and Michael Allen (68) were 9 under.