Pettersson returns to the world top 50 at No. 49 this week.
There was little movement in the top 20.
Tiger Woods remains No. 1 and is trailed by Phil Mickelson, Padraig Harrington, Sergio Garcia, Vijay Singh, Henrik Stenson, Ernie Els, Stewart Cink, Geoff Ogilvy, Steve Stricker, Adam Scott and Justin Rose as the top 12 remained unchanged from last week.
Lee Westwood and Jim Furyk exchanged places with Westwood up one to 13th this week. K.J. Choi inched up one to No. 15 bumping Anthony Kim down to 16th.
Kenny Perry and Trevor Immelman held steady in the 17th and 18th positions. Miguel Angel Jimenez moved up one to 19, while Rory Sabbatini dipped one to 20th this week.