Question: What Louisville event had an American Thoroughbred racehorse as it's winner in 2017?
Sentence (from "Oxbow (horse)"): Oxbow (foaled March 26, 2010), an American Thoroughbred racehorse, is best known for winning the second jewel in the United States Triple Crown of Thoroughbred Racing, the 2013 Preakness Stakes.
Relevant evidence: No