Tiger Woods remained No. 1 following his return and was trailed in the rankings again by Sergio Garcia and Phil Mickelson. Ogilvy's move to No. 4 dropped Padraig Harrington, Vijay Singh, Henrik Stenson and Robert Karlsson down one spot apiece to fifth through eighth.
Camilo Villegas was up one spot to No. 9, dropping Kenny Perry to 10th, while Anthony Kim and Lee Westwood remained 11th and 12th.
Casey advanced 10 places to 13th based on his appearance in the Match Play final.
Ernie Els remained 14th, Steve Stricker dropped two places to 15th, Rory McIlroy was up one spot to 16th, Jim Furyk dipped two places to 17th, Stewart Cink was up four notches to 18th, Adam Scott and Mike Weir dipped one place apiece to 19th and 20th and Justin Rose and K.J. Choi both dropped out of the top 20.