Who'd be a goalkeeper? Replays show the contrasting fortunes of Adrian there as he made a brilliant one-handed save to keep Willian out and then shelled one into his own net seconds later.

Go again.

Tasty start by Newcastle as Nabil Bentaleb nips the ball from Gareth Barry's toes and looks to be in. Instead of having a pop himself he tries to square it to Miguel Almiron but it's a poor pass and the chance is gone.

Adam Williams
BBC Sport at Madejski Stadium

Easy as you like for Sheffield United within 90 seconds of the kick-off.

David McGoldrick has waited what must seem like a generation between goals and he won't be presented with many easier chances than that to put a free header away under absolutely no pressure whatsoever.

Dream start for the Premier League side and not what would've been in the script of Reading manager Mark Bowen's team talk in the dressing room.

Phil McNulty
BBC Sport chief football writer at Stamford Bridge

Liverpool had started brightly but that was an absolute shambles to give Chelsea the lead.

Fabinho gifted possession to Willian and then Adrian's attempted save was an absolute horror show.

Chelsea encouraged. Liverpool rattled.

Michael Grimwood: Shocker from Adrian, any keeper at this level should save that with ease #bbcfootball, external

Eoghain: Too many games this season. Liverpool are just too tired. Don't think that will be the last mistake we see.

Alistair Magowan
BBC Sport at The Hawthorns

A great noise being made by both sets of supporters inside The Hawthorns as the game kicks off. Newcastle have over 5,000 supporters cheering them on, with a few inflatables referencing that er, goal celebration, by one fan after the winner at Oxford United in the fourth round.

Billy Gilmour likes a tackle, a terrier in there.

Jermaine Jenas
Ex-Tottenham and Newcastle midfielder on BBC One

They deserve that. Chelsea have come out with real intent, playing on the front foot.

Adrian had just made an unbelievable save but he has got to save that. He's pointing at the others but that is his error. That was a shocker unfortunately.

And they're under way at The Hawthorns.

Don Hutchison
Ex-Liverpool midfielder on BBC Radio 5 Live

That is a goalkeeping error.

Adrian pulled off a wondersave a bit earlier but that must have moved, he never looked like saving it.

Lots of pats on the back for Dwight Gayle from West Brom players as the teams line up in the tunnel.

Gayle scored 23 goals in 39 league games for the Baggies on loan last season but starts this one on the Magpies bench.

Steve Bruce's side are wearing an all orange strip.

We're almost ready to go.

What a save! Pedro carries the ball downfield, Ross Barkley lets the ball run through to Willian and somehow Adrian keeps it out.

Great save!

Now Ross Barkley rattles the palms of Adrian from a good 30 yards. Good open game this.

How's your view tonight?

Image source, BBC Sport

A good ball sends Sadio Mane in on goal, well almost, but he runs out of space and then at the other end it's Pedro who nearly gets in. He tries to find Olivier Giroud when a shot was on and the groans from the stands suggest Pedro has done that a bit recently...

It's a decent game this - Divock Origi whips in a cross and Sadio Mane is close to meeting it with a flying header. Just too high though.

Jermaine Jenas
Ex-Tottenham and Newcastle midfielder on BBC One

Brilliantly worked, but Rudiger on his heels should have been expecting that. I played with a player at Spurs, William Gallas, who used to get two or three goals a season at that back post.