When you watch the Kentucky Oaks tonight, look for a solid brown filly whose jockey is in orange and brown checkered silks. Her name is Chocolate Martini, and trainer Tom Amoss bought her at a claiming race. That got listener Elizabeth Jesse thinking.

"So my best friend, her name is Hayley Amoss, and her dad is a trainer, Tom Amoss," Elizabeth said. "And he claimed a horse that’s actually running in the Oaks. Her name is Chocolate Martini and they only paid 25,000 for her. So that kind of sparked my curiosity about if there’d ever been a claimer in the Derby."

Elizabeth asked Curious Louisville whether any claimed horses had run in the Derby, and what's the least expensive horse that has run. WFPL's Laura Ellis looked for an answer.