Barcelona and Paris Saint-Germain have played out a goalless first half in the second leg of their Champions League quarter-final at the Camp Nou.
The home side are going through as it stands thanks to last week's 2-2 draw in France.
PSG were in superior form during the opening 45 minutes and enjoyed much of the possession against their opponents.
Their first decent chance came on 30 minutes when Ezequiel Lavezzi's effort was pushed away by Victor Valdes.
The Barca goalkeeper was called into action again moments later as he clawed away Lucas Moura's header from Zlatan Ibrahimovic's cross.
The home fans grew increasingly restless with their team's display as the half wore on, but their name will be in the hat for the last four of the competition if the score stays as it is.
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