SONOMA, Calif. – official release — Al Steinberg photo — The battle for this year’s Cooper Tires USF2000 Championship Powered by Mazda fittingly came down to Saturday’s USF2000 Grand Prix of Sonoma finale at Sonoma Raceway with the three title contenders running 1-2-3 at the front of the 21-car field. Friday’s winner, RC Enerson, grabbed the initiative for Team E …