Follow with 5 Live Final Score including live commentary
FT: Liverpool 2-0 Leipzig (agg 4-0) - Salah opens scoring on the night & Mane adds to it
Tie played in Puskas Arena in Budapest due to Coronavirus restrictions
PSG 1-1 Barcelona (agg 5-2) - Mbappe scores penalty, Messi levels with stunner but has penalty saved
PSG 1-1 Barcelona (5-2 on agg)
Goalmouth scramble alert!
Jordi Alba plays in Lionel Messi, who turns to get a shot away but Marquinhos produces a sensational block to deny him.
Antoine Griezmann is there to meet the follow-up, but PSG do just enough to get the ball clear.
Super defending by Marquinhos.
Liverpool 0-0 RB Leipzig (2-0 on agg)
Important glancing header from Nat Phillips to turn away a dangerous RB Leipzig cross. Hwang Hee-chan then has a pop from just outside the box but gets a horrible slice on his effort and puts it well wide.
PSG 1-1 Barcelona (5-2 on agg)
A double change for PSG.
Mauricio Pochettino calls on Angel di Maria and Danilo, who replace Julian Draxler and Idrissa Gueye.
Half an hour left for PSG to survive.
Liverpool 0-0 RB Leipzig (2-0 on agg)
The visitors make two more changes as Justin Kluivert and Hwang Hee-chan come on for Emil Forsberg and Yussuf Poulsen.
RB Leipzig need to get something sometime soon if they are to threaten a comeback.
PSG 1-1 Barcelona (5-2 on agg)
The yellow cards are creeping in for PSG, as Leandro Paredes becomes the latest name in Anthony Taylor's book. That means he'll miss the next game, should PSG see this through.
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Vieira151: Can we have Fabinho and Thiago in midfield every game?! Completely dominating, mopping everything up. It's beautiful!
Liverpool 0-0 RB Leipzig (2-0 on agg)
Stephen Warnock
Ex-Aston Villa and Liverpool defender on BBC Radio 5 Live
It is lovely movement again. Diogo Jota should do better, and Mohamed Salah should definitely score on the rebound. It is another missed opportunity for Liverpool.
Liverpool 0-0 RB Leipzig (2-0 on agg)
Diogo Jota is in behind the RB Leipzig defence but his shot is too close to keeper Peter Gulasci, who can't hold the ball but Mo Salah puts the follow up over the bar.
Two really good chances, but the flag goes up late with Jota having strayed just offside.
Image source, Getty ImagesPSG 1-1 Barcelona (5-2 on agg)
Very quickly the second half has settled into the same pattern as the first, with PSG pinned back.
The lively Ousmane Dembele gets in down the left but he's robbed of possession as he looks to pick out a team-mate in the box.
Liverpool 0-0 RB Leipzig (2-0 on agg)
Diogo Jota breaks down the left, comes inside but gives the ball away and a promising attack comes to an end. RB Leipzig break and catch Trent Alexander-Arnold out of position but Fabinho is there to sweep up.
Image source, Getty ImagesPSG 1-1 Barcelona (5-2 on agg)
An early booking for Idrissa Gueye at the start of the second half as he chops down Antoine Griezmann.
PSG are going after Barca much higher up the field so far, certainly compared to the desperate edge-of-the-box blocks that they were putting in at the end of the first half.
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Garett T Switzer: Two years ago Dembele missed one too many sitters against Liverpool and it cost Barca. Looking that way again tonight against PSG. Between his performances and his injuries, he really has been a huge financial burden with little return for Barca.
Liverpool 0-0 RB Leipzig (2-0 on agg)
A couple of long balls over the top from RB Leipzig, Lukas Klostermann chases the latest one but runs out of pitch and the ball is behind for a Liverpool goal kick.
Steady start to the second half.
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Barca missing Luis Suarez so much! Messi watching his teammates missing too many chances that he knows he'd put to bed.
Daniel, London
PSG 1-1 Barcelona (5-2 on agg)
One change to report, and it's for PSG. Abdou Diallo has replaced Layvin Kurzawa.
Liverpool 0-0 RB Leipzig (2-0 on agg)
Stephen Warnock
Ex-Aston Villa and Liverpool defender on BBC Radio 5 Live
Fabinho has picked up some nice positions and intercepted some balls that have been aimed towards the strikers and he's allowed Georginio Wijnaldum and Thiago to press a little bit higher, and to run past the forwards.
Leipzig have changed to a 4-4-2 at the start of this half.
Liverpool 0-0 RB Leipzig (2-0 on agg)
RB Leipzig have made a change with Kevin Kampl replaced by Alexander Sørloth, once of Crystal Palace.
An attacking change with RB needing to find two goals at least.
PSG 1-1 Barcelona (5-2 on agg)
Back under way too at the Parc des Princes. Here's a quick recap for those just joining us.
Kylian Mbappe put PSG 5-1 up in the tie from the penalty spot after Clement Lenglet was harshly penalised for a foul on Mauro Icardi, before Lionel Messi scored a stunning long-range goal to draw Barca level on the night.
But Messi's penalty miss in first half injury-time may prove awfully costly to his side, who still need three goals to take this to extra-time.
Right then, what drama could unfold in the second halves in Budapest and Paris?
We're under way in Liverpool's game with PSG-Barcelona not too far behind.
Liverpool 0-0 RB Leipzig (2-0 on agg)
Stephen Warnock
Ex-Aston Villa and Liverpool defender on BBC Radio 5 Live
It could be better for Liverpool, but it could also be a lot worse. They are low on confidence and if that chance goes in after 10 minutes, and Alisson doesn't make the save, you've got a completely different game on your hands and you are having to come out a little bit more and you're a little bit nervous. I don't think that would suit Liverpool at the moment - 0-0 is a good scoreline for them.
The game is still on a knife edge because we've seen the quality that Leipzig have. Jurgen Klopp will be asking his forwards to be more clinical.