What Louisville event had an American Thoroughbred racehorse as it's winner in 2017?
Always Dreaming: Always Dreaming (foaled February 25, 2014) is an American Thoroughbred racehorse. Always Dreaming:  He won the Florida Derby in his first graded stakes race appearance and then won the 2017 Kentucky Derby. 2017 Kentucky Derby: The 2017 Kentucky Derby (in full, the Kentucky Derby Presented by Yum! 2017 Kentucky Derby:  The Kentucky Derby is a horse race held each year in Louisville, Kentucky, on the first Saturday in May, at the end of the two-week-long Kentucky Derby Festival.
2017 Kentucky Derby