CHICAGO - You could ask more of the guy. You could ask him to be perfect, since he had one turf starter at this National Jockey Club meet who lost. The other three horses whom trainer Chris Block sent out to run on the Hawthorne grass course this spring came back winners. It was much the same last fall, when Block won far more than his share of grass races at the Hawthorne meet. Saturday, bettors have another chance to catch a Block-trained grass horse, as he sends Big Bold Sweep out in Hawthorne's featured 10th race.