The Associated Press

CONCORD, N.C. - Greg Biffle won the rain-postponed Busch Series race at Lowe's Motor Speedway Saturday with the season's largest margin of victory.

The race started eight hours before the Winston Cup race - and Biffle was one of 11 drivers entered in both.

Biffle, the Busch champion last season, beat Michael Waltrip to the finish by 12.628 seconds.

It was his 10th career Busch win and first since August 2002.

"These guys do a fantastic job. We've just really started to get ourselves going here lately," Biffle said. "This car was on the rail all day."

Series points leader David Green was sixth and holds a 36-point advantage over Vickers with five of 34 races remaining.

RIGGS REPLACING BENSON? Busch Series driver Scott Riggs is expected to move up to the Winston Cup series next season, but where he lands is a matter of garage speculation.

The latest theory has him replacing Johnny Benson in the No. 10 Pontiac next season, but Benson said Friday that's news to him.

"I have a contract here with another year on it, and I have a ride for next year, so unless we're going to have three cars, there's too many drivers in the mix," he said. " ... Nobody has said anything to me. Unless they come to the right people, we're going ahead as planned."

TRUCKS: Brendan Gaughan came from the back of the pack and won Saturday at Texas Motor Speedway, becoming the first NASCAR truck driver to win four straight races at the same track.