ASCOT, UK--There's nothing quite like Royal Ascot to inject some interest into the first-season sires' championship and, with three days down and two to go, there will be several stallion masters with an extra spring in their step following the results of this week's juvenile contests. As Roger O'Callaghan of Tally-Ho Stud said on Thursday afternoon, "Royal Ascot is very important. This week can make the horses." And the O'Callaghan family has reason to be doubly pleased with the way the races have fallen so far this week. Their own...