Barca had dominated for long spells .
The game was still scoreless deep in the second half when Arsenal were caught on the break as Luis Suarez and Neymar combined to help Messi opening the scoring on 71 minutes .
Barca had dominated for long spells but the game was still scoreless deep in the second half when Arsenal were caught on the break as Luis Suarez and Neymar combined to help Messi opening the scoring on 71 minutes .