Louis Oosthuizen and Charl Schwartzel have swapped places once again, while Rory McIlroy has moved up to second in the latest world rankings.
Oosthuizen, who finished T28 at the Arnold Palmer Invitational, regained his 27th place from Schwartzel, who finished 45th at the same event.
South Africa’s best-placed golfer, Branden Grace, remains in 19th place.
Dean Burmester moved up ahead of Jaco van Zyl as the sixth best South African on the rankings, with Van Zyl now at risk of dropping out of the top 100.
At the top of the rankings, McIlory moved into second spot after a T4 finish at Bay Hill. The Northern Irishman finished seven shots ahead of Jason Day, with the Australian dropping down to third as a result.
The only other move inside the top 20 was Tyrell Hatton, who finished alongside McIlroy, moving up to 14th, with compatriots Danny Willett and Paul Casey moving to 15th and 16th respectively.
Top 10 South African rankings:
Branden Grace – 19
Louis Oosthuizen – 27
Charl Schwartzel – 28
Brandon Stone – 75
Richard Sterne – 91
Dean Burmester – 97
Jaco Van Zyl – 99
Dylan Fritelli – 133
George Coetzee – 148
Thomas Aiken – 151