Legends: Zenyatta.

2010 Horse of the Year Zenyatta won 19 of her 20 races, with her only loss coming in the 2010 Breeders’ Cup Classic to Blame. The mare was a three-time Older Female Eclipse award winner and broke the all time North American record for Grade 1 victories by a filly or mare. She retired with 13 Grade 1 victories and over $7.3 million in earnings.