Nate Stacy of Owasso, Okla., became the youngest GTS winner in the Pirelli World Challenge Saturday at Sonoma Raceway with a sensational driving exhibition in his No. 14 Roush Performance Ford Mustang Boss 302.Stacy, 16, was the youngest PWC winner ever two years ago at when he captured the TCB...

Veteran Kevin Marshall drove the No. 44 VSA Motorsports Lotus GT4 to the fastest time Friday morning at Sonoma Raceway in the opening GTS practice round.Marshall, the 2009 Lotus Cup champion, jumped to the top of the timing sheets early in the overcast conditions at the 2.38-mile, 12-turn circuit just...