Dan Blacker’s crop of dark hair bobbed along atop a sea of admirers as he made his way through a mosh pit of MyRacehorse partners threatening to storm the Del Mar winner’s circle. Straight No Chaser , the object of their hysteria, had just fulfilled the promise he had shown since coming under Blacker’s care as a 2-year-old. And now, after more than three years and 10 agonizingly spaced starts, the 5-year-old son of Speightster stood atop the racing world as the winner of the $1.84 million Breeders’ Cup Sprint (G1) on a cool Nov. 2 afternoon, right where his journey began.