Towards the end of each match, a Most Valuable player from both sides is selected. Usually the match commentators will decide this, but sometimes it's the match sponsor, a local celebrity, or the broadcasting production unit.
The selection of a MVP doesn't necessarily have anything to do with what's happened on the pitch. It might be that it's the only player whose name the selector can remember, that the selector's been bribed, or that the player in question represents a lucrative sponsorship deal. Some have even gone so far as to suggest the selection process is entirely random, and names are just drawn out of a hat.
It has also been postulated by Crow that it's not completely random. He said, "I have a sneaking suspicion (based on some recent testing) that MVP may be /weighted/ towards the players that make the most die rolls during the match. i.e. not /entirely/ random."