It is a risky bet, but I like Zenit here. They showed in the first 2 matches that they can play equally with Barcelona. Today they will have fans in the hall and it will be an advantage for them.
Barcelona surprised me in a negative way. Jaskevicius as a coach needs to learn a lot, he made a lot of mistakes and only luck saved him in the 2nd match to not lose again. I don't buy that Barcelona is not under pressure today, they still need to win today or tomorrow at least. What I saw they have big problems with stopping Pangos and on the other side, Mirotic is not receiving enough balls to show why he is one of the best players in the Euroleague.
All in all, Zenit will have their chances today and maybe they will win in the end.