There was no movement in the top-10 from last week as Tiger Woods remains No. 1 heading into the season's third major, the British Open Championship.
Woods is followed by reigning PGA Champion Vijay Singh, 2002 Open champion Ernie Els, 2004 Masters winner Phil Mickelson and two-time U.S. Open winner Retief Goosen.
Sergio Garcia held on to the sixth spot with Adam Scott, Jim Furyk, Padraig Harrington and David Toms following him to round out the top-10.
Chris DiMarco remained No. 11 and Kenny Perry stood par at 12. Angel Cabrera, who tied for fifth behind Clark, climbed two spaces to 13th.
Davis Love III slipped one notch to 14 and Luke Donald also dropped one to 15. Darren Clarke inched up to 16th, while Clark jumped to 17.
Stewart Cink tumbled two places to 18th, while Justin Leonard dropped one to No. 19. Miguel Angel Jimenez maintained the 20th position from last week.
Stuart Appleby fell five spots to No. 24 this week.
PGA Tour rookie Sean O'Hair claimed his first win at the John Deere Classic on Sunday and won a spot in this week's British Open. He improved 40 places to No. 53 this week. O'Hair has made the cut in 14 of his 18 starts so far this season and that has helped his rise from 1155th in the world at the end of 2004.