Grace won the Alfred Dunhill Links Championship for his fifth tournament title of 2012. He started the year No. 271 in the rankings and the latest victory boosted him another eight places to No. 37.
Ryan Moore won the PGA Tour's Shriners Hospital for Children Open and improves his ranking five spots to 39th in the world.
Lee Westwood is fourth with an average of 6.984 but the rest of the Top 10 is bunched together.
Justin Rose (6.350) is fifth but just more than half a point better than No. 10 Jason Dufner (5.841). In between is Adam Scott (6.267) in sixth while Bubba Watson is No. 7 with an average of 6.117 while No. 8 Webb Simpson comes in at 5.974 and ninth-ranked Brandt Snedeker is ninth at 5.883.