The Thoroughbred Charities of America will host an online auction of halters worn by Triple Crown and Kentucky Derby winners during the upcoming virtual "Kentucky Derby: Triple Crown Showdown." The halter auction is set to open Friday at 9 a.m. and will conclude Saturday at 9 p.m. EST. All proceeds will benefit TCA. "As the 13 Triple Crown winners face off in the virtual running of the Derby, we are excited to offer halters worn by the only two living Triple Crown winners American Pharoah and Justify, as well as...