That 45 minutes has absolutely flown by!

It remains 0-0, but nobody is going to be asking for their money back.

Robert Lewandowski has had the best chances and Barca the greater number.

Julian Nagelsmann chews his fingernails on the Bayern bench. This is fraying everyone's nerves.

Another Liverpool chance. Well two.

Liverpool play quickly through the lines and Trent Alexander-Arnold cuts inside and hits an effort straight at Ajax keeper Remko Pasveer, who also stops his follow-up attempt.

Barcelona want a penalty.

Ousmane Dembele is taken down in the box but did Bayern defender Alphonso Davies get ball or man and in what order and to what degree?

The call on the pitch is 'no penalty'. VAR agrees.

Liverpool look so much better when Thiago is on the ball. The former Barcelona and Bayern Munich midfielder beats a couple of men and then picks out Luis Diaz.

The Reds' Colombian winger goes down in the box as he's challenged by Devyne Rensch but that's a good bit of solid defending.

Image source, Getty Images

Robert Lewandowski denied again!

Pedri's brilliant run and ball sets up the striker to fire first time but his effort is blocked at source by a superb sliding block from Noussair Mazraoui.

Getting in each others' way!

Jamal Musiala gets in down the right for Bayern and sends in a superb ball with the outside of his boot. Sadio Mane and Thomas Muller make a right mess of it in the middle, though, both darting to the near post and colliding to allow Barca to clear.

Chris Sutton
Former Blackburn striker on BBB Radio 5 Live

Alvarez is holding on to Van Dijk and as the ball is coming over. Van Dijk reads the flight of the ball well and says ‘get off’ to Alvarez. He powers a header at goal that Pasveer does well to save.

Close. Virgil van Dijk gets on the end of Trent Alexander-Arnold's out-swinging corner and heads straight at Ajax's 38-year-old goalkeeper Remko Pasveer, who grabs the ball at the second attempt.

Bayern are struggling with the final ball.

A few times now they've been in and around the Barca box in numbers but a key pass has gone astray. Sadio Mane the latest to end a home attack with a sloppy ball.

Phil McNulty
BBC Sport chief football writer at Anfield

An emphatic finish by Mohammed Kudus but Liverpool manager Jurgen Klopp will ask questions about how easily Ajax got in behind Trent Alexander-Arnold.

Liverpool, at this time at least, are very vulnerable and it happens in almost every game.

Image source, Getty Images

Liverpool right-back Trent Alexander-Arnold catches a volley from 25-30 yards out. It swerves and dips just over the Ajax crossbar.

So close.

This might be the firs little lull in the otherwise frantic action of this game. I say lull... it's still being played at a rapid pace.

Chris Sutton
Former Blackburn striker on BBB Radio 5 Live

Kudos to Kudus. But it's all about the midfield run from Berghuis. He’s looking to find Bergwijn in the box, but the ball eventually goes through to Kudus. Off the underside of the crossbar, it’s a devastating finish.

Image source, Getty Images

Close again!

Marcel Sabitzer is picked out on the edge of the box by Leroy Sane and he whips a shot past the post, much as Raphinha had done not long before at the other end.

How is this still 0-0?

The whole game is being played on the charge and the edge. Raphinha is almost in for another shot but Alphonso Davies gets back just in time to nip in and clear.

Only four players have scored more goals for an English side in the Champions League than Mohamed Salah has for Liverpool (34); Sergio Agüero for Man City (36), Didier Drogba for Chelsea (36), Thierry Henry for Arsenal (35) and Ruud van Nistelrooy for Man Utd (35).

Bayern respond.

Sane, Mane and Musiala are all involved to set up Noussair Mazraoui, but his low effort from an angle is saved by Marc-Andre ter Stegen.

Brilliant game.

Liverpool well on top now and going for a second goal. Luis Diaz zips an effort wide of the left corner before Diogo Jota zings one a couple of yards wide of the same post, about 30 seconds later.

Image source, Reuters