|U.S. golfer Bubba Watson hits off the 12th tee in final round play on Torrey Pines South course during the Farmers Insurance Open PGA golf tournament in San Diego, California January 30, 2011. (REUTERS/Mike Blake)
PHILADELPHIA -- Bubba Watson's second PGA Tour win helped him improve 15 spots to No. 18 in this week's world golf rankings.
The top three remained the same with Lee Westwood first followed by Martin Kaymer and Tiger Woods. Phil Mickelson took second place behind Watson and moved up two places to No. 4.
Graeme McDowell slid one spot to fifth, while Volvo Golf Champions winner Paul Casey jumped three to No. 6. Steve Stricker dipped a pair to seventh, while Rory McIlroy and Jim Furyk both slipped one to eighth and ninth, respectively.
Luke Donald held steady on No. 10 and was again followed by Ernie Els, Ian Poulter and Matt Kuchar.
Dustin Johnson improved two places to No. 14. Retief Goosen dipped a notch to 15th, Robert Karlsson inched up a spot to 16th, while Francesco Molinari fell two places to 17th.
Watson was followed by Louis Oosthuizen and Edoardo Molinari, who both dropped one to 19th and 20th.
Tim Clark, last week's No. 20, tumbled two to 22nd this week.