The largest Kentucky Derby crowd of the 21st century gathered under the historic Twin Spires to watch undefeated Derby favorite Big Brown power through the stretch and dominate a full field of 20 horses in the Grade I Kentucky Derby Presented by Yum! Brands. Big Brown won the Kentucky Derby on Saturday, living up to his status as the pre-race favorite. Filly Eight Belles finished second, then collapsed with two broken front ankles and was euthanized after crossing the wire. The field of 20 horses was galloping out around the first turn at Churchill Downs when Eight Belles suddenly went down on both front legs and jockey Gabriel Saez slid off. An equine ambulance reached her on the track and put Eight Belles down.