This is not how Jeff Gordon envisioned celebrating the 20th anniversary of his first NASCAR Sprint Cup Series victory.

After running just 11 laps in Saturday's first practice session at Charlotte (North Carolina) Motor Speedway, he brought his No. 24 Hendrick Motorsports Chevrolet back to the garage and parked it for the day.

"Unfortunately, I had a back spasm the other night in that last qualifying run I made, and I've been trying to get it worked out by today, and it just wasn't," he said. "The good news is that the car is awesome."

Gordon's team has contacted Regan Smith to serve as a possible relief driver for Sunday's Coca-Cola 600.

Gordon already has a victory this season and qualified his car Thursday, so if he were to sit out Sunday's race, he would not lose his eligibility in the Chase for the Sprint Cup so long as he remained in the top 30 of driver points.

"It's really about getting prepared for 600 miles," Gordon said. "I have no doubts that I can be in this car and be competitive (Sunday) if I just take it easy over the next 24 hours."

Also, Kyle Larson raced to his second Nationwide win of the season, holding off Brad Keselowski and Kyle Busch in the 200-lap race at the 1.5-mile oval.

Formula One: Nico Rosberg took the pole for Sunday's Monaco Grand Prix after making an error that left Mercedes teammate Lewis Hamilton irate.

Late in qualifying at the 2.075-mile course, Rosberg lost control coming out of a turn, sliding down an escape road. After he backed out onto the circuit, a yellow flag came up -- and Hamilton couldn't improve on his time. Points leader Hamilton insinuated afterward he'd get revenge.

"I have apologized to Lewis," Rosberg said. "I locked up the rears (tires)."

NHRA: Sisters Brittany and Courtney Force established a series first, racing to No. 1 qualifying positions in the Kansas Nationals at Heartland Park Topeka. Brittany had a time of 3.746 seconds at 329.75 mph to claim her first No. 1 in Top Fuel. Courtney had a 4.009 run at 322.96 in a Ford Mustang to earn her fifth career Funny Car No. 1. Father John Force qualified second in Funny Car.

Misc.: Driving a Mazda MX-5, Marine Staff Sgt. Liam Dwyer, who lost much of his left leg in combat, and Tom Long teamed to win the IMSA Continental Tire SportsCar Challenge event at Lime Rock Park (Connecticut). "I can't explain how awesome this feels," Dwyer, 32, said.

The Associated Press contributed to this report.