The big problem in this match were the cards, he showed a lot of them, under his criterion the cards were OK, but I still think that Pezzotta could have avoided that big amount of cards if he gets a little bit relaxed, but if he wants to be a rigorous referee he could have shown a red card to a player of Colo-Colo.
I like the referees who have a rigorous style, but they have to be very neutral if they chose to be this way, I like Pezzotta's style but today he had a little compassion and that is not always good if you are a referee like him. I once heard a narrator who said that, if a referee shows more than 8 yellow cards and no player saw the red, he had problems, I think that´s what happened, he showed 9 cards and the red could have been showed.
Good first half, the second was a bit boring because Colo-Colo was winning 3-1 and Santos had not clear chances to score.