Oh Callum!

Keeper Roberto Jimenez goes full Superman but misses John Lundstram's cross from the right.

Callum Robinson, placed behind, probably expected the keeper to punch away the ball and sees his attempted header into an empty net instead turn out to be a shouldered effort which goes wide.

We do have a goal now though...

A second effort on target in the match and again it is produced by the visitors.

This time a free-kick is swung into the area from the left and David McGoldrick leaps highest to nod the ball towards goal - it floats straight into the gloves of keeper Roberto Jimenez.

McGoldrick was offside anyway.

Chris Basham looks like an extra from 300 as he yells to his troops in his rain-soaked kit after clearing the danger.

The Blades continue to be put under pressure.

This match has been teetering on the brink of something - not quite sure what it is yet...

Eleven mins from half-time.

The best chance of the match so far falls to the visitors!!!

A corner-ball is headed towards goal by Jack O'Connell and finds David McGoldrick, whose back-flick effort is brilliantly saved by Roberto Jimenez.

Moments earlier, Issa Diop was shown yellow for a foul on McGoldrick.

It's hammering it down.

Pun intended.

The Blades defence clear a sixth corner-ball from their own area.

No.

But the groans turn to applause of appreciation seconds later as Felipe Anderson's curling shot from distance clear the crossbar by a few inches.

West Ham win another corner following Mark Noble's perfect sliding tackle on John Egan.

However, the visitors once more clear the danger.

Moments later, Andriy Yarmolenko wins the home side their fifth corner of the match.

Can they make more of this one?

What a great opportunity wasted for the Blades.

David McGoldrick is sent clear on the right but with Callum Robinson having bust a gut to get into the right position, he overcooks his cross.

West Ham seem to be getting a bit of joy down the flanks, especially through Snodgrass.

For a side known for its closing down of players, the Blades aren't doing a very good a job of that at the moment.

The Blades clear once more as keeper Dean Henderson just about gets a fist to the delivery from the right.

Snodgrass again causes a nuisance. His ball into the area is cleared behind by Enda Stevens for a corner.

The Hammers then win another corner.

Pressure.

Snodgrass almost makes amends of his earlier poor delivery as his ball into the box almost finds the boot of a stretching Andriy Yarmolenko.

Bit of a scare for the visitors.

But the South Yorkshire side win a free-kick from the dead ball.

It wasn't the greatest delivery from Snodgrass either.

The Blades have enjoyed the first few seconds of possession.

No highlights of any note yet - it's a bit wet in East London btw.

Having said that. Robert Snodgrass has just won a corner for the home side.

Under way at a bubble-plagued London Stadium.

Just spotted a West Ham fan holding up a Hammers shirt with Tevez written on the back.

He had a big grin on his face.

... the women's side face tough clash against Chelsea on Sunday.

Gilly Flaherty, Alisha Lehmann & Julia Simic try jellied eels and it's fair to say their reactions are priceless.

Simon Brotherton
BBC commentator

There's bound to be an edge to this game as it's the first Premier League meeting between the sides since West Ham controversially avoided relegation at Sheffield United's expense in 2007.

The Hammers eventually paid a reported £20m to Sheffield United in an out-of-court settlement, having avoided a points deduction for breaching rules on third-party ownership when they signed Carlos Tevez and Javier Mascherano in August 2006.

Tevez's goals kept the Hammers up of course, while Sheffield United remained outside the top flight until their return this summer.

On the evidence of their performances so far this season, both sides should at least be able to avoid a repeat of that bitter relegation battle 12 years ago.

Mark Lawrenson
Ex-Liverpool defender

West Ham have had a bit of a dip with their recent results, and they did not play well when they lost to Everton last weekend.

That kind of inconsistency is just what West Ham seem to do, but maybe they won't do it as many times this season.

Sheffield United boss Chris Wilder keeps getting it right, with his latest success being his side's impressive win over Arsenal on Monday.

Lawro's prediction: 2-0

Find out what Arnold Schwarzenegger's prediction for this game was here.