The Super Fight (1970)
The Super Fight was a fictional 1970 boxing match between Rocky Marciano and Muhammad Ali. At the time, Ali and Marciano were the only undefeated heavyweight champions in history and fans often debated who would win had they met in their primes. Ali and Marciano were filmed acting out every possible scenario in a fight and the result was then determined using probability formulas entered into a computer. The final fight was only shown once in select cinemas around the world and later released as a DVD.
More at Wikipedia.