Els, No. 4 in last week's rankings, claimed his first PGA Tour win since the 2004 WGC-American Express Championship and his 16th overall. He bumped Steve Stricker down to fourth.
There was no other movement in the top 13 spots in the rankings.
Tiger Woods remained No. 1, of course, and was followed by Phil Mickelson, Els, Stricker, Adam Scott, K.J. Choi, Justin Rose, Jim Furyk, Rory Sabbatini, Padraig Harrington, Vijay Singh, Henrik Stenson and Sergio Garcia.
Luke Donald finished second to Els and moved up two spots to 14th in the rankings, dropping Angel Cabrera and Stewart Cink down to 15th and 16th.
Geoff Ogilvy, Aaron Baddeley, Zach Johnson and Lee Westwood rounded out the top 20 in the same positions they held last week.