PHOENIX - For most high school seniors, Saturday means thinking about what you're going to do with your buddies and maybe even the prospect of a date.
Those more traditional concerns were not on the mind of 18-year-old D.J. Fuller last Saturday. Fuller, who recently passed his trainer's license exam in Arizona, was putting on the tack for his first starter, Canyoutopthis, in the second race at Rillito Park near Tucson.