Kyle Busch's drive for five at Texas Motor Speedway was delayed by rain.
The wet weather and more showers in the forecast led to the postponement of Saturday's Nationwide race in Fort Worth, Texas, where Busch is trying to join two-time series champion Jack Ingram and Dale Earnhardt as the only drivers to win five consecutive races in NASCAR's second-tier series at the same track.
The race, which was called off more than three hours after it was supposed to start, was rescheduled for tonight after the Sprint Cup race.
Weather still could be an issue today, when there is a good chance for more rain.
If both races are run today, Nationwide points leader Brad Keselowski and Busch are among 15 drivers scheduled to do double duty. That would mean 800 miles behind the wheel at the 11/2-mile, high-banked track 500 miles for the Cup race and 300 more in the Nationwide race.
''It's going to be a long day,'' Keselowski said. ''Those are tough days. Those kind of days challenge you, not only as a competitor, but as an athlete. . . . It makes it interesting.''
Indy Racing League
Will Power earned his third consecutive Indy Racing League pole, giving him a shot at a third win in four races.
The winner in Brazil and St. Petersburg, Power had the fastest qualifying time at the Grand Prix of Long Beach, Calif., finishing just ahead of Ryan Hunter-Reay.
Power completed the 11-turn, 1.968-mile temporary street course in 1 minute, 9.3185 seconds. The Team Penske driver also earned the pole last week in Alabama, where he finished fourth, and in St. Pete.
Justin Wilson was third and Helio Castroneves, last week's winner, was fourth. Defending Long Beach champion Dario Franchitti was well back in 12th. Today's race through downtown Long Beach will be 85 laps, covering 167.2 miles.
Sebastian Vettel led qualifying for the Chinese Grand Prix in Shanghai, narrowly edging his teammate Mark Webber on Saturday to give Red Bull its fourth straight pole position of the Formula One season.
It is the first time a team had taken four consecutive pole positions since Ferrari claimed the first four in 2007. Vettel qualifying a quarter of a second ahead of Webber.
Ferrari's Fernando Alonso qualified impressively to take third, while Mercedes' Nico Rosberg will start from fourth today, when rain is forecast.
McLaren pair Jenson Button and Lewis Hamilton disappointed in qualifying and will start from fifth and sixth, ahead of Ferrari's Felipe Massa and Renault's Robert Kubica. Michael Schumacher of Mercedes and Adrian Sutil of Force India rounded out the top 10.
Del Worsham raced to the top qualifying position in Funny Car at the SummitRacing.com NHRA Nationals in Las Vegas.
Worsham powered his Toyota Solara to a 4.187-second run at a top speed of 297.75 mph to earn his first No. 1 position since the 2007 season and fifth overall.
Antron Brown (Top Fuel) and Mike Edwards (Pro Stock) also will lead their respective categories into today's eliminations as the No. 1 qualifiers.
Brown claimed his second No. 1 of the season and 23rd of his career with his run from Friday of 3.881 at 316.60.
Pro Stock racer Edwards improved on his leading performance Friday with a 6.687-second run at 205.88 mph.