Romero's eighth victory on the European Tour moved the Argentine to 30th in this week's rankings while Jacobson, now a six-time runner-up on tour, climbed 83 spots to 101st.
Jeff Sluman captured the Greater Milwaukee Open and rose 18 notches to No. 48. He will be on hand this week to defend his title at the B.C. Open while many of the top stars are at Muirfield for the 131st British Open.
Tiger Woods held on to first for the 152nd consecutive week as he readies for the Open Championship. This year Woods became the first player to capture the Masters and U.S. Open in the same season since Jack Nicklaus in 1972. Nicklaus was not able to win the British Open that year but Woods has his eye set on the third leg of the Grand Slam.
Phil Mickelson, Ernie Els, Retief Goosen and Sergio Garcia took Nos. 2 to 5 in the rankings as they prepare to stop Woods from inching closer to history.
David Toms, the reigning PGA Champion, is sixth, followed by Davis Love III and 2001 British Open champion David Duval. Duval will need to right the ship if he is to become the first player since Tom Watson in 1982-83 to successfully defend his title. Duval hasn't made a cut in either major this year and has missed the weekend in his last three starts.
Vijay Singh and Ireland's Padraig Harrington round out the top 10.
Nick Price and Jim Furyk switched places from last week with Price coming in 11th and Furyk dropping to No. 12.
Chris DiMarco remained in 13th, while Michael Campbell jumped two to 14th and Darren Clarke fell one to 15. Colin Montgomerie moved two to No. 16 while Argentina's Angel Cabrera stayed pat at 17.
Bob Estes fell three to 18th as Kenny Perry and Rocco Mediate flip-flopped from last week. Perry took the 19th spot this week with Mediate coming in 20th.
Lee Westwood's decline down the World Rankings continued this week. He dropped to 102nd and fell out of the top 100 for the first time since 1996. Westwood was ranked eighth at the same time last year.
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