Martin Keown
Former Arsenal defender on BBC One

"Peterborough only know one way to play - fast forward. They want to win this game in 90 minutes. they are playing with great belief."

Hang on! Peterborough want to get this wrapped up in 90 (+3). Coulibaly stretches his legs - and the Albion backline - but can't create a golden chance.

The fourth official lifts up his electronic board to reveal...three minutes of stoppage time.

Ah one of the oldest tricks in the book! A substitution to run down some valuable seconds. Peterborough bring off Shaquille Coulthirst with Souleymane Coulibaly coming on to provide some legs up front.

A flurry of Albion corners...nothing doing. Peterborough survive. Two minutes plus stoppages...

Another Baggies chance...again Michael Bostwick comes to Peterborough's rescue. Albion corner...

Image source, Getty Images

Right, here we go. The last five minutes...

And we nearly have a winner! Saido Berahino shoots into an empty goal after a poor clearance from Posh keeper Ben Alnwick. But Michael Bostwick scampers back to hack off his goal-line!

Fancy watching Jon Taylor's opener again? Good news, here you go...

Peterborough aren't out of this. And with 54 goals in their 29 League One games you wouldn't bet against them bagging another. Not this time though. Shaquille Coulthirst drags a shot wide from 20 yards, his second attempt after overplaying on the edge of the box when he had a better chance to shoot.

Reading boss Brian McDermott is wrapped up under a black overcoat in the London Road stands. He's here to see his team's fifth-round opponents, but has no idea who that will be. Me neither, Bri. Anyone's game.

Ten minutes to go. If we don't find a winner we go to extra-time...

Image source, Getty Images

Craig S: What a strike by Fletcher, he's been West Brom's best player. Impressed with Posh though, Samuelson has really shone

Want to see that Albion goal in graphical form? You're in luck. Decent move by West Brom and a stunning finish from Darren Fletcher (24) ...

Image source, .

Stephane Sessegnon is providing some attacking spark for the visitors. He runs from deep, laying off to Salomon Rondon who has peeled off to the right. Oh no! The Venezuelan gets his feet in a tangle though, slicing high and wide.  

Albion are finding their rhythm now, swaying into a gentle jig as they look to find a killer move. Stephane Sessegnon blazes over from distance as the resurgent visitors go again.

Phil Shepka
BBC Sport

West Brom fans haven't had much to shout about this match, but that goal has given hope to the away supporters, who battled horrendous traffic on the A14 to get here.

Martin Keown
Former Arsenal defender on BBC one

"We said it needed a wonder strike and he certainly thumped that in. It is a sweet strike.

"He's a leader and you need those sort of club men who are going to pull you out of trouble.

"Just wondering about Peterborough psychologically here - how will they react? They have to stay solid and manager Graham Westley has to believe in his team."

This Martin Samuelsen looks a real player. The 18-year-old West Ham loanee looks like butter wouldn't melt, but he has an evil attacking streak. He slices through the West Brom defence again, this time striding through the middle, teeing up a corner that Lee Angol pokes over.

Albion pair Ben Foster and Jonas Olsson are still having a right old ding dong. Come on lads, less of the domestic - Valentine's Day is coming up after all. Let's have some love.