Westwood, a former Order of Merit champion, had been ranked as high as No. 4 at one point in his career but a lengthy slump dropped him out of the top-100. Now the Englishman vaulted 50 spaces in the rankings courtesy of his most recent triumph to come in at No. 61 this week.
Tiger Woods, who will defend his title at the WGC-American Express Championship this week, stayed put as the top-ranked golfer in the world. Ernie Els, who was the runner-up at the dunhill links championship, remained No. 2.
PGA Tour money leader Vijay Singh held onto his third-place ranking followed by Davis Love III, Jim Furyk, Mike Weir, Davis Toms and Kenny Perry, all of whom were unchanged in the rankings.
Retief Goosen exchanged positions with Padraig Harrington this week to move to No. 9 with the Irishman falling to No. 10.
Phil Mickelson, Nick Price, Darren Clarke, Chris DiMarco, Justin Leonard, K.J. Choi and Robert Allenby all held their positions from last week.
Adam Scott climbed one spot to No. 18 while Jay Haas dropped one position to No. 19.
Sergio Garcia rounded out the top-20.
Tommy Armour III, who established a new 72-hole scoring mark on the PGA Tour with his winning total of 254 at the Valero Texas Open on Sunday, improved his standings to No. 140 in the world this week.