Palmer, joint leaderovernight, carded a 69 to finish alonein second, a strokein front of fellow AmericanBo Van Pelt (67) andSouth African Retief Goosen (65).
American Bovan Pelt (66) finished alone in ninth on 11 under, one shot ahead of compatriots Matt Kuchar, Webb Simpson, Kevin Streelman and Jason Dufner.
Former World No.1 Lee Westwood made the biggest move of the day, tapping in from 17 inches on the final hole for a birdie to card a 65 and move to 11-under, the same mark as BoVan Pelt.