All Times EDT

NASCAR SPRINT CUP

Sprint Cup 500

Site: Fontana, Calif.

Schedule: Today, qualifying (Speed Channel, 6:30 p.m.); Sunday, race (ESPN, 7 p.m.).

Track: Auto Club Speedway (D-shaped oval, 2 miles, 14 degrees banking in turns).

Race distance: 500 miles, 250 laps.

Fast facts: Joey Logano will join Joe Gibbs Racing next season, replacing Tony Stewart in the No. 20 Toyota, while Reed Sorenson signed a multiyear contract to join Gillett Evernham Motorsports, where he'll join Kasey Kahne and Elliott Sadler in 2009. ... Edwards and Busch have combined to win six of the last seven races and 14 of 24 this season. Edwards was the runner-up in three of Busch's victories and Busch was second in Edwards last two wins. Edwards won the February race at Fontana, while Busch earned his first career victory there in 2005. ... There are two races remaining before the Chase for the championship. Denny Hamlin (11th place), Clint Bowyer (12th) and David Ragan (13th) each moved up one position, while Kasey Kahne finished 40th at Bristol to fall to 14th. ... Dale Earnhardt Jr., Jimmie Johnson and Jeff Burton can all clinch spots in the Chase this weekend.

Next race: Chevy Rock & Roll 400, Sept. 6, Richmond, Va.

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INDY RACING LEAGUE

Detroit Belle

Isle Grand Prix

Schedule: Saturday, qualifying, 11:30 a.m.; Sunday, race (ABC, 3:30 p.m.).

Track: The Raceway at Belle Isle (street course, 2.096 miles, 13 turns).

Race distance: 188.64 miles, 90 laps.

Last race: Helio Castroneves, driving a hastily prepared backup car, snapped a 29-race winless drought at the Grand Prix of Sonoma. The win came five days after one of Team Penske's trucks caught fire during the long trek from its race shop in North Carolina to California, badly damaging the primary cars of Castroneves and Ryan Briscoe. The teammates then drove to a 1-2 finish.

Last year: Tony Kanaan gambled and won the Detroit Indy Grand Prix. The Brazilian, the leader after a late restart, had enough fuel to win the shortened race and avoid a last-lap melee that collected Scott Dixon and Kanaan's Andretti Green Racing teammate Dario Franchitti. Danica Patrick avoided the wreckage to finish second.

Fast facts: Dixon suffered through one of his worst days of the season at Sonoma by finishing 12th. His lead in the standings shrunk from 78 points to 43 heading into this weekend's event, the penultimate points race of the season. ... Tony Kanaan and Dan Wheldon were both eliminated from championship contention after finishing third and fourth, respectively, at Sonoma. ... Venezuelan rookie E.J. Viso finished sixth at Sonoma, his best effort since a season-best fourth-place on the street circuit at St. Petersburg in the second race of the season. ... The Formula One (1982-88) and Champ Car (1989-2001) circuits once held events in Detroit. In 1992, the track was moved from downtown Detroit to Belle Isle Park, located approximately two miles east of the city.

Next race: Chicagoland 300, Sept. 7, Joliet, Ill.

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NHRA

Mac Tools

U.S. Nationals

Site: Clermont, Ind.

Schedule: Today, qualifying, 5:15 p.m.; Saturday, qualifying, Noon (Sunday, ESPN2, 12:30 a.m., tape); Sunday, qualifying, 11 a.m. (ESPN, 11:30 a.m., tape); Monday, eliminations, 11 a.m. (ESPN2, 7 p.m., tape).

Track: Indianapolis Raceway Park.

Last event: Tony Schumacher raced to his fifth straight Top Fuel victory and 10th of the season, beating Larry Dixon with a 3.845-second run at 313.88 mph in the Toyo Tires Nationals at Maple Grove Raceway. Also, Jack Beckman raced to his second Funny Car victory of the season and Jeg Coughlin (Pro Stock) and Matt Smith (Pro Stock Motorcycle) won their divisions.

Last year: Schumacher took the NHRA playoff lead with his sixth Mac Tools U.S. Nationals victory in eight years. Schumacher drove away from Larry Dixon in the final, finishing in 4.575 seconds at 331.94 mph, to earn a spot in the winner's circle with Funny Car victor Mike Ashley, Pro Stock's Dave Connolly and Pro Stock Motorcycle winner Craig Treble.

Fast facts: This is the final event before the Countdown to the Championship. All 10 spots in the Funny Car playoffs have been claimed. Pro Stock's Dave Connolly, Mike Edwards and V. Gaines clinched spots at Maple Grove Raceway, leaving two spots open in that category. The are two Top Fuel spots up for grabs, while four Pro Stock Motorcycle drivers will compete for the final three berths.

Schumacher will be trying to tie Joe Amato's record of 52 career Top Fuel victories. ... Smith took over the Pro Stock Motorcycle lead with his victory at Maple Grove, jumping 73 points ahead of Andrew Hines.

Next event: Carolinas Nationals, Sept. 14, Charlotte, N.C.