Westwood, who has won the tournament twice before, pulled away from the field last year to win by seven strokes.
Tiger Woods notched the last of his four birdies at the par-four 18th, balancing four bogeys as he built a 54-hole total of 11-under par 205 and maintained his two-stroke cushion over 2007 Masters champion Zach Johnson.
Tiger Woods carded 10-under 62 to take a two-shot lead over first round leader Zach Johnson.
Tiger Woods birdied the fifth and 11th -- both par-fives -- but he missed a golden opportunity at 18 when he missed a four-foot birdie putt.
After a 2013 season that included five victories -- but no additions to his 14 major titles -- the world number one says his goals for the coming season haven't changed.
The Northern Irishman overhauled crowd favourite and reigning US Masters champion Adam Scott with a final round 66 to win the Australian Open on Sunday by a single shot with an 18-under-par tally.
McDowell was four shots behind when the round started, but rallied with a closing 69 over wind-blown Harbour Town Golf Links.
Graeme McDowell, who capped a stellar 2010 season that saw him win the US Open with a victory in this unofficial post-season invitational, hadn't won anywhere in the world since then.
Graeme McDowell and Jim Furyk, a pair of U.S. Open champions, managed to beat par at The Olympic Club. Tiger Woods simply got battered.
Tiger Woods won the Chevron World Challenge on Sunday, the one-shot triumph in an unofficial 18-man event his first victory since a 2009 sex scandal shattered his iconic image.