Mickelson had a late charge to beat the Australian Stuart Appleby, the winner of last week's Honda Classic. Mickelson picked up six strokes in six holes on the back nine to finish 16 strokes under par. Appleby came in at 13-under with a bogey on the final hole for a round of 69.
Tied for third place at 12-under were Payne Stewart, with a 67, Mark O'Meara, who closed with a 70, and overnight leader Omar Uresti, who shot 71.
"Winning Arnold Palmer's tournament makes this win so special, especially to do it the week that he came back from cancer," Mickelson, 26, said of the tournament's legendary host who returned to the links after recent prostate cancer surgery.
Only Jack Nicklaus won more tournaments than Mickelson by the age of 26, but the Golden Bear had won all four major titles by that age. Mickelson, who has yet to win a major, won $270,000 (pounds 168,000) for this victory.Reuse content