neymar opens the scoring for barcelona after just 18 minutes thanks to an assist from lionel messi .
luis suarez makes it 2-0 after a brilliant individual goal - nutmegging david luiz before beating two more defenders .
suarez scores his second of the night in equally stunning fashion - again nutmegging luiz .
gregory van der wiel 's deflected effort gives psg some hope ahead of the second leg on april 21st .