SPARTA, Ky. (AP) - Imagine what he might have done with his fastest car.
Driving his backup, Brad Keselowski raced to his series-leading third victory of the year, grabbing the lead with 55 laps remaining and holding off all challengers Saturday night in the NASCAR Sprint Cup race at Kentucky Speedway.
"It wasn't the newest car we got, but it runs," Keselowski said.
The 28-year-old from Rochester Hills, Mich., picked up his seventh win in his five years on the circuit. He won earlier this year at Bristol and Talladega.
Kasey Kahne rode a late surge to second place, 4.399 …