The top seven places in the rankings remained the same. Tiger Woods, who will return to action in two weeks at the U.S. Open, held on to the top spot.
Woods was followed by Phil Mickelson, Retief Goosen, Vijay Singh, Jim Furyk, Ernie Els and Sergio Garcia. The first change came at No. 8 where Australian Adam Scott inched up one space.
To make room for Scott, former PGA champion David Toms fell a place to ninth. David Howell remained No. 10, while Jose Maria Olazabal was up one to 11. Luke Donald dipped one to 12. Henrik Stenson held steady at 13 this week.
Tim Clark and Chad Campbell exchanged places with Clark up to 14 and Campbell dropping to 15th. Australians Geoff Ogilvy and Stuart Appleby traded spots as Ogilvy took 16th this week with Appleby slipping to 17.
Darren Clarke inched up one space to 18th this week and was followed by eight-time European Tour Order of Merit winner Colin Montgomerie. The Scotsman jumped three spots after taking fourth at the Wales Open.
Defending U.S. Open champion Michael Campbell rounded out the top 20 this week and he remained in the 20th position. Chris DiMarco tumbled three spots to No. 21 this week to make room for Montgomerie.
Robert Karlsson won the Wales Open by three strokes. With that win, he jumped 61 spots to 94th in the world.