DEL MAR, CA - NOVEMBER 02: Lancaster Bomber, owned by Michael Tabor, Derrick Smith &amp; Mrs. John Magnier and trained by Aidan P. O'Brien, exercises in preparation for the Breeders' Cup Las Vegas Dirt Mile at Del Mar Thoroughbred Club on November 2, 2017 in Del Mar, California. (Photo by Michael McInally/Eclipse Sportswire/Breeders Cup)