Horse racing isn't really a cage match like you suggest. It's called the sport of kings and it's pretty well regulated (mafia fixes notwithstanding). There are rules about impeding progress of other horses, they didn't pull a "1972 Olympic Men's Basketball" where a soviet referee started making up phantom calls to guarantee a Soviet win over a dominant USA team. But hey, I don't know what I'm talking about so you have that to consider :-)
Thank you.