Mickelson, who won for the first time since last year's Masters, received a bump of two places to No. 4 in the world, dropping Ernie Els and Retief Goosen one spot apiece to Nos. 5 and 6 respectively.
Tiger Woods, of course, remained No. 1 in the rankings and was followed by Jim Furyk, Adam Scott, Mickelson, Els, Goosen, Vijay Singh, Luke Donald, Henrik Stenson and Padraig Harrington to round out the top 10.
Stenson moved up one spot to No. 9, dropping Harrington to 10th where he was trailed by Geoff Ogilvy, Trevor Immelman, Sergio Garcia, Paul Casey, Davis Love III, Nick O'Hern, David Howell, David Toms, Colin Montgomerie and Stuart Appleby.
The only players in positions 11-20 who lost ground from a week ago were Garcia, who was replaced by Immelman at No. 12; Howell, who dipped two places when Love moved up to 15th; and Chris DiMarco, who was replaced by Appleby at No. 20.