STICKNEY, Ill. - For years Carlos Silva was the go-to rider for the renowned trainer Richard Hazelton, and when Hazelton finally left training for good two summers ago at Arlington Park, Silva, who had retired from riding, was basically running the shed row. Silva took out his own trainer's license and has made a go of things the last two seasons thanks to backing from the Asiel Stable of Dr. Richard Radke, a longtime Hazelton owner.