Here are the billionaires competing at the Kentucky Derby — and their odds of winning Renegade, owned by billionaires Robert and Lawana Low, and Mike Repole, has 4-1 odds of winning the Kentucky Derby on Saturday. Alex Slitz/Getty Images The 152nd Kentucky Derby starts on Saturday morning at Churchill Downs Racetrack. The first-place winner receives $3.1 million and the coveted Kentucky Derby trophy. Here are some of the billionaire owners who could cash in. Horseracing is an expensive sport. So it's no surprise that among the crowd cheering on 20 thoroughbred horses during the Kentucky Derby's main race at Churchill Downs Racetrack on Saturday are at least eight billionaires. The annual event has once again descended upon Louisville, bringing with it a blur of pastel outfits, flamboyant hats, and mint juleps. The annual event, entering its 152nd year, is the pinnacle of American horse racing and draws competitors from around the world.…