Of the five horses signed on for Saturday's GI A. G. Vanderbilt H., two are already winners of Grade I races at Saratoga, and a third has been successful at Grade III level while placing in Grade I company. In a different year, any of the three could go favored in the six-furlong dash, but not this one, as they all have the very exciting and very fast Volatile (Violence) to beat. His sire's priciest offspring, having fetched $850,000 as a Keeneland September yearling nearly three years ago, the gray...