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updated 5:48 p.m. ET Feb. 3, 2013

(Reuters) - Phil Mickelson held off a last-day charge by fellow American and playing partner Brandt Snedeker to end a week of scintillating golf with a four-shot triumph at the Phoenix Open in Scottsdale, Arizona on Sunday.

Left-hander Mickelson birdied three of the last six holes to close with a four-under-par 67 at the TPC Scottsdale, completing a wire-to-wire victory with a record-tying 28-under total of 256 to clinch his 41st PGA Tour title.

The 42-year-old Californian, who never relinquished his grip after taking control of the tournament with a stunning first-round 60, joined Arnold Palmer, Gene Littler and Mark Calcavecchia as triple winners of the Phoenix Open.

FedExCup champion Snedeker, who birdied four of the first nine holes to pile early pressure on the pacesetting Mickelson, had to settle for second place after signing off with a 65.

(Reporting by Mark Lamport-Stokes in Los Angeles; Editing by Steve Ginsburg)