Andrea Pirlo was outstanding for Juve in the 3-1 win.
Mazzarri said: "This game was very simple tactically, as there were duels all over the pitch. In those situations the players most accustomed to being at the top and to winning will win the duels.
"I saw the possession almost equal, so it wasn't dominated by Juventus, but the details do make the difference in these games.
"I thought Kovacic was in the ideal position to play brilliantly, as he'd have more space when going deeper. We knew he had quality.
"After Ruben Botta came in, Pirlo wasn't quite so free. There was meant to be someone on him, Kovacic, and that person didn't go enough, so he'd get stuck in-between and leave us a man down in midfield."
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