CONCORD, N.C. -- Greg Biffle began an 800-mile day by winning the rain-postponed Busch Series race at Lowe's Motor Speedway on Saturday with the season's largest margin of victory.
The Little Trees 300 was scheduled for Friday night, but was delayed by bad weather. So it 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," said Biffle, who has been substituting frequently in Evans Motorsports' No. 7 Chevrolet since the team released driver Randy LaJoie in June. "This car was on the rail all day."
Despite the final margin, Biffle did have trying moments.
He gave a nudge to Jason Keller while attempting to put him a lap down and had several other close calls with lapped traffic.
Biffle "drives right on the edge," Waltrip said. "It wasn't surprising to me when I drove up alongside of him to see scrapes on the right side of his car. That's a testament to how hard he goes after it."
Mike Bliss finished third, Brian Vickers fourth, and Jamie McMurray fifth. Everyone in the top five except Bliss was scheduled to run in the Cup event, including Vickers, who was to make his Winston Cup debut.
Series points leader David Green was sixth and holds a 36-point advantage over Vickers with five of 34 races remaining.
Pole winner Kevin Harvick, who shares driving duties with Johnny Sauter in Richard Childress Racing's No. 21 team, finished ninth. The No. 21 team holds a 156-point advantage in the chase for the series' car owner championship.
Of the 11 Winston Cup drivers scheduled to compete in both races, only series points leader Matt Kenseth opted out.
Kenseth, who has lost 177 points the past two weeks and now leads Harvick by just 259, decided Saturday morning to let Jeff Burton drive in his place.
"We just decided that it's best to concentrate on the (Cup) team right now with where we are in the points," Kenseth said. "Eight hundred miles in one day is a lot, and I want to make sure I'm fresh at the end of the Cup race if I need to be."