Borussia Dortmund were in the saddle from start to end. Actually, two very early goals (minutes 4' and 5') clinched the encounter in the very early stages. When Zenit made noises of coming back into it (57' and 69, respectively). Borussia were alert, responded quickly and maintained their safe lead (61' and 71'. respectively).
Both Zenit's goal were due to refereeing errors. Otherwise, they probably wouldn't have scored any. Their first goal came after a sequence of two offsides undetected by ar Cryans - the first one a clearly active offside, as the ball was conrolled and played by a forward who had been offside beforehand, the second one should have been deemed offside, as the offside player interfered with a defender who tried to clear the ball. The second goal came from a converted penalty-kick, which should have never been awarded. Worse than that, Piszczek who was adjudged committing the foul that never was (a tackle clean as a whistle), was shown the yellow card.
The referee could have had the easiest of evenings as the final result was actually settled five minutes into the game. But he underpeformed, his foul-detection was questionable in midfield, and as mentioned above, compounded them with the atrocious penalty-box blunder. There were not too many replays, thus From what could be seen in "real time", ar Conquer performed very well.