Doug Cauthen still vividly remembers watching from the tunnel at Del Mar as the field reached the starting gate for the 2017 GI Breeders' Cup Classic. When Gun Runner seized the lead and zipped through an opening quarter of :22.50, Cauthen retreated a little further back into the shadows. "I was sweating bullets," Cauthen admitted, laughing at the memory. "They were flying on a track that wasn't really providing a lot of opportunities for horses on the lead. That race was loaded and it was his only other time that...