US Masters champion Phil Mickelson claimed consecutive PGA Tour titles for the first time in his career with a four-stroke victory at the $5.3 million Pebble Beach National Pro-Am in California on Sunday.

The world number four, seven shots clear at the start of the day, held off a strong challenge from fellow left-hander Mike Weir as a one-over-par 73 earned his 25th tour win in difficult conditions.

Mickelson, who also triumphed at last week's Phoenix Open, mixed two birdies with three bogeys on the Pebble Beach Golf Links course to finish on 19-under 269, one stroke shy of the tournament record for 72 holes set by fellow American Mark O'Meara in 1997.

"It's been fun, it sure feels great to start this way," said 1998 Pebble Beach winner Mickelson. "I've been playing well the last couple of weeks and I'm excited to get the year started with a couple of wins."

Canadian Weir, the 2003 US Masters champion, had to settle for second place on 15-under after firing a 67, the best round of a cool and blustery day on the picturesque Monterey Peninsula.

Britain's Greg Owen, playing in his first PGA Tour event of the season, was a further two shots back in third place after closing with a 72.

South Africa's Tim Clark (71) built on his brilliant early season form to finish in a tie for fourth with Paul Goydos (71) on 12-under 276.

Early in the round, a smiling Mickelson stretched his advantage to nine shots. But after back-to-back bogeys on the ninth and 10th, concern was written on the 34-year-old's face in the knowledge that Weir was then five back.

WIRE-TO-WIRE

Mickelson, however, steadied himself with a birdie and seven consecutive pars to become the first wire-to-wire winner in the 68-year history of the event.

"I'm obviously pleased with my play but it could have been better," said Weir, who will try to carry his momentum over to the Nissan Open which starts on Thursday, a tournament he has won for the last two years.

"I think that was one of the better rounds I've ever played. But it could have been a very special round if a few shots could have dropped for me.

"Even though I was 10 shots back (at one stage), I thought I had a chance."

Fresh from a five-stroke victory at the Phoenix Open, which included a course record-equalling round of 60, Mickelson carried his blistering form to California.

He opened with a record 10-under 62 at the Spyglass Hill course before following up with a 67 at Poppy Hills to set a 36-hole tournament record. He fired another 67 on Saturday to add the 54-hole mark to his collection.

"It's only two weeks," cautioned Mickelson, who made his professional debut in 1992 at Pebble Beach.

"I want to use this as a stepping stone, we have a lot of big tournaments coming up, the Players Championship, the Masters...I want to be ready."