Englishman Luke Donald has surrendered the world number one ranking to Rory McIlroy after struggling at the RBC Heritage on Sunday, while Adam Scott remains the highest-ranked Australian.
Scott is 11th in the world, six spots ahead of Jason Day, while the in-form John Senden is 31st.
Aaron Baddeley (41) and Geoff Ogilvy (48) are the other Australians in the top 50.
Meanwhile, Brendan Jones jumped back into the top 100 after his win at the Token Homemate Cup on the Japan Golf Tour.
Jones moved from 116th to 86th in the world after his nine-under 62 in the final round helped him to a two-shot win.
Donald could only finish tied for 37th at the PGA Tour event in South Carolina, as Swede Carl Pettersson recorded a stunning win.
The 34-year-old needed a top-eight spot to retain number one, leaving McIlroy, who had a week off after the Masters, to go back to the top.
Donald, who won the Transitions Championship in March, said he was eager to be more consistent after a rollercoaster start to 2012.
"Is it (losing number one) a concern? No," he said.
"Obviously, I'd have liked to have played a bit more consistently this year. I built it up nicely last year through tournaments and winning a bunch."
Pettersson took out the event by five shots from American Zach Johnson, helping him jump from world number 68 to 35.
Malaysian Open winner Louis Oosthuizen closed in on the top 10, rising seven spots to 12th in the world after his victory.
Behind Donald are Englishman Lee Westwood and American pair Bubba Watson and Hunter Mahan, while German Martin Kaymer is sixth.
Americans Steve Stricker, Tiger Woods and Phil Mickelson, and England's Justin Rose, complete the top 10.