Last Triple Crown Winner Horse. Prior to american pharoah’s triumph, the drought between triple crown winners. Seattle slew was the first and remained the only undefeated triple crown winner until justify joined him in 2018.

He was trained by sunny jim fitzsimmons, who also taught gallant fox. Who are the last two triple crown winners in horse racing? Seattle slew was the first and remained the only undefeated triple crown winner until justify joined him in 2018.