This won't be exactly what you're looking for but......Greydog Software are working on a MMA sim ran from the promotional side of things. The game is called World of Mixed Martial Arts (or WMMA for short) and is due to be released during autumn/fall of this year. Here's the link.
WMMA is a PC-based management simulator set in the world of Mixed Martial Arts. The player takes control of an MMA company, and is in charge of just about everything to do with its running, including hiring fighters, match making, marketing, and so on.