Concord, N.C. ? Greg Biffle began an 800-mile day by winning the rain-postponed Busch Series race Saturday at Lowe’s Motor Speedway 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 had 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.

Greg Biffle celebrates his win in the Little Trees 300. Biffle won the Busch Series race Saturday in Concord, N.C.

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Gaughan wins Truck race: Brendan Gaughan came from the back of the pack and won Saturday at Texas Motor Speedway in Fort Worth, Texas, becoming the first NASCAR Truck Series driver to win four straight races at the same track. Gaughan beat Travis Kvapil’s Chevrolet by 1.905 seconds with an average speed of 122.727 mph that was slowed by six cautions for 29 laps.

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Tracy has CART pole: Rookie Tiago Monteiro topped the second day of qualifying Saturday for the Mexico Grand Prix to join pole-sitter Paul Tracy on the front row of today’s race in Mexico City.

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IRL a five-man shootout: Gil de Ferran will be out front for the start of the Indy Racing League’s season-ending Chevy 500 today at Texas Motor Speedway in Fort Worth, Texas, after winning the pole for the final start of his career.

De Ferran trails co-leaders Scott Dixon and Helio Castroneves by 30 points. Tony Kanaan is seven points behind, and Sam Hornish Jr. is 19 behind.