The Breeders’ Cup horse races return to Del Mar this week with tens of millions of dollars on the line for competitors and even more for bettors.

As horses complete their training and jockeys and trainers talk tactics for the 14 races Friday and Saturday, Oct. 31 and Nov. 1, here’s what you need to know to enjoy the sport’s richest event in North America.

What’s at stake

The competition is formally known as the Breeders’ Cup World Championships, and the results will go a long way toward determining who is named North American Horse of the Year and which horses, jockeys, trainers, owners and breeders win Eclipse Awards as championships of their specialties in votes next January. Saturday’s $7 million Breeders’ Cup Classic should decide if top-ranked Sovereignty, the Kentucky Derby and Be

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