Here's a video of Seattle Slew's victory in the Belmost Stakes in 1977 -- the speedy Seattle Slew was the first horse to win horseracing's Triple Crown while remaining undefeated. He also turned in a fast time, despite the crappy track conditions that he ran on. If Big Brown manages to win today's Belmont Stakes, he will become just the second racehorse to win the Triple Crown while remaining undefeated [3:04].
Seattle Slew was not expected to be a great racehorse, so he was sold at public auction -- the first Triple Crown winner to come from such humble beginnings. Unlike most racehorses these days, Seattle Slew continued to race as a four-year-old, despite a life-threatening illness. Seattle Slew's tremendous performances, including his victories over Triple Crown winner, Affirmed, silenced all of his critics. Seattle Slew is the grandfather of Belmont Stakes winner, Rags to Riches, who is the older half-sister to Casino Drive, the one horse that was expected to provide a serious challenge to Big Brown in today's Belmont Stakes.