Rose led for most of last week's Abu Dhabi HSBC Championship but was passed Sunday by Jamie Donaldson, who collected his second European Tour title in the process. Rose wound up tied for second with Thorbjorn Olesen.
That was enough for Rose to move past Oosthuizen and into the No. 4 slot in the rankings. Oosthuizen last week had moved ahead of Rose.
Luke Donald is a close No. 3 with an average of 8.111 while Rose comes in at 6.654 and Oosthuizen is at 6.639.
Adam Scott's average of 6.189 is sixth-best with Lee Westwood seventh at 5.694 and Brandt Snedeker (5.351) in eighth. No. 9-ranked Bubba Watson's average is 5.253 and Steve Stricker (5.148) completed the Top 10.
Donaldson jumps from 47th to 29th after the Abu Dhabi win. Brian Gay won the PGA Tour's Humana Challenge Sunday, a win that rocketed him 180 places in the rankings to 116th.