Tenacity. The trait seems to be woven into the very fabric of every jockey. After all, they put their lives on the line every time they break out of a gate perched atop 1,000 pounds of heaving horseflesh. It is also the very thing that propels them to the finish line, driving them to win. Emma-Jayne Wilson is the embodiment of tenacity, the thing that has driven her to the pinnacle of racing and in more challenging times, has helped her overcome adversity. Wilson, who returned to the saddle this...