DEL MAR, Calif. – Trainer Peter Miller, surveying the Del Mar racing ovals from the box seats in the grandstand, was up on his toes, like a boxer waiting with nervous energy for the fight to begin. Stopwatch in one hand, walkie-talkie in the other, he watched Mo Forza, with whom he hopes to win the $2 million Breeders’ Cup Mile, make his way onto the grass course for his final Mile workout Sunday morning.