Tiger Woods, the reigning Masters champion, remained comfortably in first place, while Phil Mickelson, Ernie Els, David Duval and Sergio Garcia rounded out the top-five as they each held their ranking from last week.
PGA Champion David Toms and U.S. Open champion Retief Goosen were seventh and eighth, respectively. They each dropped one place from last week to accommodate Singh's move into the sixth slot.
Davis Love III and Chris DiMarco held ninth and 10th.
Northern Ireland's Darren Clarke, the runner-up to Singh in Houston, jumped five places to 11th. Canada's Mike Weir was 12th and Ireland's Padraig Harrington 13th after dipping one place each.
Jim Furyk, Kenny Perry and Bernhard Langer all fell one notch with Furyk taking 14th, Perry 15th and the two-time Masters champion from Germany coming in at 16.
Bob Estes and Rocco Mediate didn't move this week. Estes remained 17th while Mediate stayed in the 18th spot.
Scott Verplank rose one spot to No. 19 as Brad Faxon moved into the top-20.
Michael Campbell of New Zealand fell out of the top 20, coming in 23rd. Spain's Jose Maria Olazabal, whose third-place finish at the Houston Open was his sixth top-10 in eight PGA Tour starts this season, was No. 21.
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