LONG POND, Pa. — NASCAR points leader Kyle Busch wrecked his car during practice Saturday at Pocono Raceway and had to go to a backup.

Busch lost control of his Toyota as he apparently headed toward pit road with just about two minutes left in the first practice session. The car spun down the service road and tagged the inside retaining wall.

The crumpled car puttered back to the garage, where his Joe Gibbs Racing crew was already on top of the team transporter pulling out a backup. Busch, who qualified 10th and posted the third-fastest speed of the practice session, briskly headed inside the truck and stayed inside while his crew prepared the new car.

Because he's switching to a backup car, he must drop to the rear of the field at the start of today's race.

KESELOWSKI WINS IN NASHVILLE: At Gladeville, Tenn., Brad Keselowski raced to his first Nationwide Series victory Saturday night, passing Clint Bowyer with six laps to go and easily holding off his closest rivals at Nashville Superspeedway.

Kyle Busch, racing in the second of three NASCAR races in a historic weekend triple, finished 20th, three laps down. A green flag pit stop with 52 laps to go bounced him from the top five to two laps down.

Keselowski, driving for Dale Earnhardt Jr., became the seventh first-time winner in 15 Nationwide races at Nashville Superspeedway. David Stremme rallied to finish second, followed by David Reutimann and Bowyer.

Busch's setback came 24 hours after his second-place finish in the Craftsman Truck Series race at Texas Motor Speedway.

By starting Sunday at Pocono, the Sprint Cup Series leader will become the first driver to compete in all of NASCAR's top three series at different tracks on the same weekend. Busch will start in a backup car at the tail of the field, the result of a crash earlier Saturday that destroyed his primary car during practice.

HAMILTON ON POLE IN CANADA: At Montreal, Lewis Hamilton took the pole again at the Canadian Grand Prix — barely. Seconds after the checkered flag waved to signify the end of the third and final round of qualifying Saturday at Circuit Gilles Villeneuve, BMW Sauber's Robert Kubica appeared to grab his first Formula One pole, knocking Hamilton's Mercedes McLaren off the top of the speed chart with a lap of 1 minute, 18.498 seconds.

PRUETT, ROJAS WIN AT WATKINS GLEN: At Watkins Glen, N.Y., Scott Pruett overcame the heat at Watkins Glen International, running the final three hours to win the Sahlen's Six Hours of The Glen on Saturday in the Grand-Am Rolex Sports Car Series.