Player Ratings: Liverpool 5-5 Arsenal (LFC win 5-4 after penalties)
It was a magical night for Liverpool's youngsters in the end, as they came back several times to level it at 5-5 and take the match to penalties. It was a pretty shocking display at the back, but the same could be said of both sides but Klopp won't care after that shootout.
Liverpool began the match with a mix of youth and experience and it was the experience that let the team down for large swathes of the match with Naby Keita, Alex Oxlade-Chamberlain and Adam Lallana regularly giving away the ball all too easily.
It was a night of mistakes for both sides, but ultimately it was Liverpool who seem to have paid the bigger price for those mistakes, with Origi, Lallana, Oxlade-Chamberlain and, most surprisingly of all, James Milner squandering possession and leading to an Arsenal goal or chance.
But a 94th minute equaliser from Divock Origi led a penalty shootout, where the Reds kept their cool, scoring all five of their penalties, whilst Kelleher save the penultimate penalty from Arsenal.
Caoimhin Kelleher - Couldn't really have done much for the goals 3-5 but was quite poor for their first two. Looks a little bit nervy at times and likes to stay on his line. He emerged as the hero of the shootout though, saving Arsenal's fourth and setting up a quarter final. 7
Neco Williams - The young Welshman was quite impressive going forward but left a lot to be desired in defence. Had little protection though, considering he had a 16 year old in front of him. Delivered a beauty to set up Divock Origi for the equaliser though! 7
Joe Gomez - The experienced centre back of tonight's pairing, Gomez - again - had a wobbly one and was given a lot of problems by Martinelli. Can't expect to displace Lovren, nevermind Matip, on displays like that tonight. 6
Sepp van den Berg - Looks classy on the ball but, for a lad of his size, was all too easily shoved off the ball. Looked at odds alongside Gomez tonight. 6
James Milner - The experienced midfielder slotted in at left-back again but was not at his usual best. Scored the penalty just before the break but his delivery was awful all night and his poor back pass led to Arsenal's fourth goal. Calmly slotted home our first penalty. 6
Adam Lallana - Was decent in spells but why Klopp insists on playing him in that holding role is a mystery. He's just not suited to it at all. Much like Gerrard under Rodgers, it's a move that makes no sense and stifles a lot of his natural instincts. Either way, he was the better of our midfield three and assisted the youngsters well. Scored his penalty with aplomb. 6
Naby Keita - Anonymous for large parts of the game. When he did have the ball he invariably gave it away or simply went sideways. Limped off 10 minutes after the break. His lack of form and constant injuries must surely be starting to concern Klopp. 4
Alex Oxlade-Chamberlain - The 'Ox' was a mixed bag. Constantly gave the ball away in the first hour, but set up the own goal opener for the Reds and scored an absolute screamer to make it 4-3. Was in and out of the match after that. Looked well below the level to really cause Henderson or Gini any concern in the first team though. 6
Harvey Elliott - He didn't score or assist but he was a constant outlet and a constant danger down Arsenal's right. He's a joy to watch at times and his ability to change direction and whip in a cross were a real source of threat for Liverpool. At just 16, he still has a lot of work to do but highly impressive once again. Didn't take a penalty. 7 Man of the Match
Divock Origi - Had a solid game, did Big Div. Looked a threat down the left side in the first half and started coming more central. Scored a real beauty too, to level the scores to 4-4 that gave Martinez no chance. Then scored the equaliser to make it 5-5 and put away his penalty. Jurgen Klopp seems to see a player in big Div and on nights like tonight we see it too. 7
Rhian Brewster - Worked hard but got little joy even from Arsenal's shaky back line. Is still a work in progress but still looks a long way behind the first-team level just yet. Just squeezed his penalty through but he'll be pleased with that. 6
Curtis Jones - Looked comfortable in possession and keen to get on the ball. Stepped up and scored the winning penalty. How's that for bottle? 6
Pedro Chirivella - Always looks a classy player but you wonder why he's being used when, at 22, Klopp clearly has no plans for him at the club. 6