LOUISVILLE, Ky. - Master of Hounds, the Irish raider who will attempt to win the Kentucky Derby on Saturday, arrived at Churchill Downs at 9:45 a.m. Tuesday morning following a flight from Ireland. His van pulled into the stable area and was immediately taken to the quarantine barn, where he will reside during his stay here. KENTUCKY DERBY NEWS: Track all the 3-year-olds on the Triple Crown trail