Argentina veteran Agustin Creevy gets a big cheer as he comes on for Julian Montoya. At 38, Creevy is the fifth oldest player in men's World Cup history.

Prop Joel Sclavi is on for Thomas Gallo too.

Argentina lineout and they go for the drive.

Surely this pressure is going to tell in the end?

Kit: That was 100% the correct decision from the ref, great to see some common sense on this.

Andrew: That’s a huge call from the referee, the logic behind his decision was brilliantly explained. The match could have just hinged on that decision.

I think we all are Matt!

But back to the action and Argentina are camped on the Wales line.

There's yet another penalty coming.

Sam Costelow is on for Nick Tompkins.

There are changes in the pack too, where Dillon Lewis replaces Tomas Francis and Dafydd Jenkins comes on for Adam Beard.

Matt Dawson
Former England scrum-half on BBC Radio 5 Live

What was Mr Petti thinking?

If I was new to the game I would be in a world of confusion.

Image source, Getty Images

Nicky Robinson
Former Wales and Cardiff fly-half on BBC Radio Cymru

Wow! Nothing wrong with that? Wow.

Wales have lost their best defender when they're five metres from their own line and this is a problem.

Play resumes with an Argentina penalty into the corner and a lineout drive.

If they score it will be hugely controversial.

The crazy thing is that Nick Tompkins is being told he MUST leave the field for a head injury assessment.

So how no card?

James Hook
Former Wales fly-half on BBC Radio Wales

That's straight in the jaw - that's a straight red card for me!

Where is the mitigation there?

Oh wow, it's not even a card. That's a huge call by referee Karl Dickson.

Wales captain Jac Morgan looks perplexed and wants an explanation.

Caryl James
Former Wales wing on BBC Radio Cymru

I say red!

Nicky Robinson
Former Wales and Cardiff fly-half on BBC Radio Cymru

Nick Tompkins was in the ruck and he's falling and Guido Petti comes flying in and catches him on the chin.

Red or not?

Guido Petti could be in trouble here.

Straight shoulder to the head of Nick Tompkins.

That may be a little harsh Ed, but I know what you mean.

Ireland or New Zealand will be strong favourites.

Ed: Whoever wins tonight's game will annihilate the winner of this.

Argentina carrying hard and there's yet another penalty coming their way. Could it be more?

James Hook
Former Wales fly-half on BBC Radio Wales

Rio Dyer has been brilliant in this tournament in terms of his work rate, chasing kicks, his aerial work - so it's the energy by Dyer that Wales need!

Oh that's unlucky for Louis Rees-Zammit, a huge kick but the bounce finally takes it over the dead ball line and Argentina are back up into the Welsh half with a scrum.

You have to say that the Welsh replacements have had an impact.

Dewi Lake at hooker and Tomos Williams at scrum-half.