ARLINGTON HEIGHTS, Ill. - Raving Rocket had barely finished Monday's third race here when Larry Rivelli's phone began ringing. That is what happens when you train a 2-year-old who wins as impressively as Raving Rocket. On the lead from the first step, Raving Rocket easily drew away from four opponents, winning a maiden race, his career debut, by almost 10 lengths. Raving Rocket ran very fast, 52.51 seconds for 4 1/2 furlongs on a sloppy track, but he did it easily.