Once again Victor Moses has space down the right and this time he's running at the defence, but Adam Henley does enough to see him off.

Image source, Reuters

Easier said than done Lawro. Blackburn look ruffled.

West Ham work it out wide to Victor Moses nicely and the cross is headed up in the air by Aaron Cresswell at the back stick. Rovers just about scramble it away.

Mark Lawrenson
BBC football expert

"The important thing for Blackburn now is to spend five minutes not to concede another goal now.

"You don't want to fall behind to West Ham and start chasing the game."

Image source, Reuters

Five passes in the build-up before Victor Moses advanced and drilled home the equaliser.

Image source, .

Willie J Foulke: Moses parted the sea of Blackburn defenders far too easily...

Use the hashtag #bbcfacup, text us using 81111 (UK only) or get involved on the BBC Sport Facebook page., external

Mark Lawrenson
BBC football expert

"From Blackburn's point of view, they let Victor Moses run with the ball and come so far. Blackburn goalkeeper Jason Steele should save that. He seemed to go down late. He was in a position to make the save, but he just didn't do it.

"Maybe he didn't want to get his hands dirty."

Didn't want to get his hands dirty? He's wearing gloves!

Yup. Plenty of stats to heap plaudits on Ben Marshall here.

That's his fourth goal of the FA Cup this season, a goal in every round and Blackburn's top scorer this season with six.

Not bad for a winger who's been plying his trade at right-back this season.

Mark Lawrenson
BBC football expert

"Squeezed is the word. Ben Marshall took it from his right foot, on to his left, and completely changed the angle. Darren Randolph did not see the ball because his view was blocked off, he could not have saved that.

"One of the centre-backs turned his back so he would not know where the ball was going. Marshall took it really well though."

Image source, Reuters

It's fair to say there hasn't been a great deal of goalmouth action... (Blackburn's heat map, left, West Ham's heat map right.)

Image source, .

Mark Lawrenson
BBC football expert

"West Ham are going to have to keep the ball and work out how to get past this Blackburn four/five at the back."

Dimitri Payet tries to wriggle into space inside the Rovers area and almost does so, but ends up clipping the ball out for a goal kick.

Image source, Reuters

From the corner Hope Akpan heads, completely unmarked, over the bar. It's a actually a decent chance.

Rovers are finding joy with some long balls. Shane Duffy sticks one into the right channel and Elliott Bennett is on to it and cuts the ball back.

James Collins and keeper Darren Randolph go for the same ball - Collins doesn't mess around and sticks it out.

Image source, Reuters

Tottenham make seven changes from the side that drew 1-1 with Fiorentina on Thursday in the Europa League, with Harry Kane returning up front.

Spurs XI: Vorm, Walker, Dier, Wimmer, Rose, Bentaleb, Dembele, Alli, Onomah, Son, Kane 

Subs: McGee, Alderweireld, Trippier, Chadli, Eriksen, Mason, Winks.

Two changes for Crystal Palace as Martin Kelly and Joe Ledley replace Pape Souare and Mile Jedinak. Yannick Bolasie is on the bench after a spell out through injury. 

Crystal Palace XI: Hennessey; Ward, Dann, Delaney (c), Kelly; Zaha, Cabaye, Ledley, Mutch; Wickham, Adebayor.  

Subs: McCarthy, Mariappa, Jedinak, Lee, Bolasie, Campbell, Gayle.  

Mark Lawrenson
BBC football expert

"Encouragement for the home supporters, Nice weight on the passes and they were able to move the ball on very quickly."

Lawro referring to that Chris Brown chance...

It's Collins in to head clear Elliott Bennett's free-kick and the Hammers counter. Darragh Lenihan has to clip Cheikhou Kouyate on halfway and earns himself the first booking of the game.

Michail Antonio displaying his defensive attributes now by heading it in the wrong direction. It gives Rovers an attacking throw-in. And from it Chris Brown draws a foul from James Collins.

Image source, Reuters