Pettersen, a five-time tour winner in 2007, had a 14-under 202 total. The 28-year-old Pettersen is winless this season, but has finishes of second, third and ninth in 10 events and is ninth on the money list.
Ji shot 64, Park had 69, and Pressel, who held a one-stroke lead over Pettersen after the second round, shot 71.
CHAMPIONS TOUR: In Concord, Mass., Loren Roberts shot 6-under 66 to take a one-stroke lead in the Bank of America Championship.
Roberts birdied the 18th to move to 10 under, one stroke ahead of Mark McNulty (70), Jeff Sluman (67) and first-round leader Tom Kite (72). Bobby Wadkins (67) was another stroke back at 8 under on the 6,741-yard Nashawtuc Country Club course.
Roberts has won seven times in his 31/2 years on the Champions Tour, but has never played in this tournament, even though he's had some success in the area. He won the 1997 CVS Charity Classic in Sutton, before the PGA Tour dropped the event.
EUROPEAN TOUR: In Munich, Germany, Martin Kaymer moved a step closer to becoming the first German winner in the BMW International Open, shooting 5-under 67 to take a six-stroke lead.
Kaymer made a 15-foot birdie putt on the final hole to move to 18-under 198 and add a stroke to his lead after Friday's breakaway round of 63. South Africa' Charl Schwartzel was second after a 66.
BRITISH AMATEUR: In Turnberry, Scotland, Dutchman Reinier Saxton won the British Amateur Championship, beating 17-year-old Englishman Tommy Fleetwood 3 and 2 in strong wind and rain on the Ailsa course.
The 20-year-old Saxton had eight birdies in 34 holes to finish off the 17-year-old Fleetwood, attempting to become the youngest winner. Saxton earned spots in the British Open at Birkdale and next year's Masters Tournament as long as he's still an amateur.
PGA PROFESSIONAL NATIONAL CHAMPIONSHIP: In Lake Oconee, Kyle Flinton and Sonny Skinner shot 3-under 69 for a share of the third-round lead with Scott Hebert in the PGA Professional National Championship at Reynolds Plantation.
Hebert, the second-round leader, had 70 to match Flinton and Skinner at 8-under 208. The top 20 finishers will get spots in the PGA Championship at Oakland Hills in August. The winner will earn $75,000 and also receive an exemption into the next five PGA Professional National Championships, a spot on the 2009 PGA Cup Team and exemptions into six PGA Tour events over a 12-month period.
PALMER CUP: Georgia Tech golfer Chesson Hadley and Georgia's Adam Mitchell will be members of the same team next week as U.S. collegiate golfers take part in the Palmer Cup competition.
Hadley, Mitchell and their teammates, including Alabama's Michael Thompson, depart for Glasgow, Scotland, today.
The eight-member U.S. team will compete against European players Thursday and Friday in the Ryder Cup-style event on the Glasgow Golf Club Gailes Links.
Mitchell is a junior from Chattanooga, Tenn. Hadley is a sophomore from Raleigh, N.C.