Now then. Free-kick for Barcelona, a shade over 25 yards out from goal but very much Lionel Messi territory. He fancies it, but curls the ball on to the roof of the net.

Must. Do. Better.

Image source, AP

Manchester United fans look away now!

Brilliant opportunity for Barcelona as a low corner routine is worked to Pedro just outside the box. The forward has time and space as he runs on to the ball and seems certain to drive a low shot into the net but no! Embarrassing air kick ensues...

Barcelona have had 80% possession but that's no good without the goals to show for it. 

Apart from smacking the woodwork once, Barcelona haven't actually really threatened the Athletic Bilbao goal.

Image source, AP

Sorry to say but not yet Anthony.

Oscar de Marcos cleverly wins Athletic Bilbao a corner by smacking the ball against a Barcelona player. Benat Etxebarria swings the ball in to a chorus of boos, and Gerard Pique leaps to power a headed clearance away. Pique has been brilliant so far at both ends of the pitch.

Twenty minutes in - the time I reckoned Barcelona needed to have at least one goal by to win this. I'll stand by that. Athletic Bilbao are looking more composed after weathering that early storm.

Image source, AP

Barcelona are committing numbers forward and are almost caught out as a result as Benat Etxebarria skips away down the right, crosses low into the area but can't quite find his team-mate.

Athletic Bilbao are playing a high line and have caught Barcelona out a few times with it, the hosts seeing the offside flag more than they would like.

However, they almost catch them out when Andres Iniesta lifts the ball over the top and Lionel Messi peels away from the defence, but just can't quite reach the ball.

Breath caught. 

After that gung-ho start things have settled down a bit now. The hosts had been throwing everything at the Athletic Bilbao backline but are now taking a more considered approach, trying to find a genuine opening, rather than force it.

Image source, Getty Images

...Ivan Rakitic takes it, the ball sails over the heads of everyone but to Luis Suarez on the far side. The striker's ball just fails to find the head of Gerard Pique, who is almost acting as a fourth striker at the moment.

Image source, AP

Probably the least surprising statistic of the evening, but Barcelona are giving it a good go in the opening 10 minutes.

Another Barcelona corner..

Image source, AP

Barcelona mean business! 

A succession of chances as first Lionel Messi lifts the ball into the area for the run of Pedro, who shoots but his effort is deflected behind. From the corner, Gerard Pique crashes a volley against the bar.

What a start to this game.

Conceding an early goal would be a disaster for Barcelona and Athletic Bilbao players know that. They are snapping and snarling at the hosts as soon as they have possession, trying to force an error. Barcelona are holding their nerve for now, though...

Yep, as expected Barcelona bolt out of the blocks and the crowd roar as Luis Suarez goes through to chase a ball over the top. Offside.

This is very much new territory for Luis Enrique. 

In his first season in charge, Barcelona beat their opponents in every one of their knockout games in the Champions League and the Copa del Rey.

A good test for the Barca boss. Can he rise to the challenge?

We are under way.

Image source, @fcbarcelona

Marc-Andre ter Stegen pays the price for conceding four goals and is on the bench, with Claudio Bravo in the side.

Confident call Kojo. 

For what it is worth, a quick start, an early goal and the comeback is on. No goals for Barcelona by the 20th minute, and I think they will struggle...  

Andres Iniesta tweeted this t'other day, and it roughly translates as: "There is nothing impossible for this team! On Monday all together for the comeback!"