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Roberts, the first-round leader by one, finished 36 holes at 9-under 133 to take a two-shot lead into Sunday's final round.

David Eger, who shot a 5-under 66, is tied for second place with former U.S. Open winner Scott Simpson (67) at 7-under 135.

At various points during the front nine Saturday as many as nine golfers shared the lead. Roberts got sole possession of the lead at the 15th when he sank a six-foot birdie putt to go to 8-under.

Roberts, who placed second last year, has three runner-up finishes in 2008, but no wins. His last victory came at the 2007 Senior Players Championship.

Last week, he held the 36-hole lead at the Bank of America Championship.

Denis Watson (67), Fulton Allem (67), Mike Goodes (68), Mark McNulty (69), Gene Jones (70) and defending champion Lonnie Nielsen (69) are tied for fourth at 6-under 136.

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Villegas gets first win on PGA Tour

Furyk, Villegas leading at suspended BMW

McIlroy builds big European Masters lead

Villegas leads BMW Championship

LPGA pulls back on English requirement

Rumford among leaders at Switzerland golf

Teen leads Switzerland golf event

Thursday's PGA tournament round washed out

State Farm expresses alarm at LPGA policy

Vijay Singh to join players in Shanghai

Tiger, Elin Woods say second child coming

Singh moving on rankings list, too

Azinger fills out U.S. Ryder Cup team

Singh wins second straight event

Sluman wins for second time in 2008

Nick Faldo chooses Poulter and Casey

Weir holds 1-shot lead in Massachusetts

Havret wins golf tournament in Scotland

Roberts in four-way tie for senior lead

Clark has 62 to lead Deutsche golf