At the highest level possible, both players of equal skill will eventually make a mistake, otherwise it would be perfect games for one player every single time.This isn't true. Match up numbers are a hypothetical prediction of the score between two players, of equal skill, playing their respective characters in a set of ten games.
Saying a match up is 10-0 just means that in a set of 10 games between these two players who are both playing at the highest level, one player won't win a game.
I think match up numbers are completely useless and people should focus more on strategies instead of crying about numbers, but that's what a 10-0 is.
And I also don't like match-up numbers. I'm thinking of making a match-up guide like I did with Cyrax, but for Martian. Won't bother with numbers.