Two-time U.S. Open champion Tiger Woods returns to action this week for the first time since the Masters and will do so as the top-ranked player in the world.
Reigning Masters and PGA champion Phil Mickelson remained No. 2 and Singh followed him. Two-time U.S. Open winner Retief Goosen slipped one to fourth this week.
Jim Furyk, the 2003 U.S. Open champ, held on to the fifth spot, while Barclays runner-up Adam Scott moved up two places to sixth. Ernie Els and Sergio Garcia each dipped a notch to seventh and eighth, respectively.
David Howell and David Toms exchanged places, with Howell up to No. 9. Luke Donald stayed put at 11 this week. Jose Maria Olazabal inched up one to 12, while Henrik Stenson slipped a spot to 13th.
Tim Clark and Chad Campbell both remained in the same positions, 14th and 15th, as last week. Australians Stuart Appleby and Geoff Ogilvy traded places, with Appleby moving up to 16th.
Ulsterman Darren Clarke held steady at 18. Reigning U.S. Open winner Michael Campbell and 2005 Masters runner-up Chris DiMarco each moved up one to 19 and 20. To make room for their climb, Colin Montgomerie tumbled two places to 21st.
Markus Brier won the BA-CA Golf Open on the European Tour and that helped him rocket up 163 spots to No. 193 in this week's rankings.