No doubt that will be the matchup to watch in the group stages.... What are your opinions?

1. Which team will strike first?

2. Which team will top the group?

3. Who is the player that will make the difference?

4. What is the most anticipated head to head player battle in this matchup?

Oddly enough Milan draw first blood against Barca, but fall 2nd to them in the group.  Pato vs Messi`

It is obviously Barcelona, to win the group comfortably, not only that but to win the Champions League too

Barcelona will win the match and the group. And this game is not going to be Messi vs Pato it will be Barcelona vs Milan. I really hate when people do that. And when they do it is never like that

I think Barca is the stronger squad, but with our other 2 clubs in the group, we should still finish 2nd in the group and advance. I think thinking the Rossoneri fair well against Barca is not that out there...