I am assuming you are talking about a situation where each of the 4 teams was engaged with a different random Team X, in other words, I am assuming that Team 1 isn't in a match with any of the other 3 teams and so on

If that's true then you are looking for the Probability that Team 1 wins AND Team 2 wins AND Team 3 wins AND Team 4 wins, since nothing you've stated would indicated any type of dependence, we can assume that these events are independent and you can therefore just multiply all of the probabilities together