Late Gamble Pays Off for Kenseth at Kentucky Speedway Matt Kenseth's fuel-only gamble on pit road helped him beat Jimmie Johnson late and win the rescheduled 400-mile Nascar Sprint Cup Series race on Sunday at Kentucky Speedway in Sparta. A race that was Johnson's to lose ultimately became Kenseth's series-high fourth victory of the season, even though he passed on getting new tires after the race's ninth caution. Johnson, the series points leader, finished ninth and leads Carl Edwards by 38 points. Rain on Saturday forced Nascar officials to postpone the race to a daytime start. ■ Nico Rosberg won the British Grand Prix in Silverstone, England, after four drivers, including the early leader Lewis Hamilton, had to deal with exploding tires. The three-time champion Sebastian Vettel quit with 10 laps remaining because of mechanical problems. ■ Tony Schumacher's engine exploded in a fireball as he crossed the finish line to win the Route 66 N.H.R.A. Nationals in Joliet, Ill. Schumacher, a seven-time season champion from nearby Long Grove, raced to his third victory of the season and the 72nd of his career.