Judging by a list in an old edition of the American Racing Manual, taking the title of leading freshman sire has often been a stepping stone to even greater success. The list features the likes of Bold Ruler, Northern Dancer, Buckpasser, What A Pleasure, Raja Baba, Roberto, Mr. Prospector, Seattle Slew, Alydar, Danzig and Fappiano. But they all took the title more than 30 years ago, when the world of Thoroughbred breeding was a simpler place. Superstardom has arguably awaited fewer of their successors, but there are still some notable...