Rest the legs now, manager Dean Saunders reckons, this one is done. He's probably right, too.

Chesterfield captain Sam Morsy eats into the 20 minutes remaining as he saunters off at leisure. 

It's Charlie Raglan who comes on to replace him - another former FC United player!

Danny Webber summarising on BBC Radio Manchester: "I said when he came on that Rai Simons is very direct and raw - but his finish was not raw, it was clinical. He had a clear run at goal and slotted it home superbly."

With FC United preoccupied with tamely missing chances down one end, Chesterfield still look dangerous on the break down the other. 

Sam Morsy has acres to cut-back for Lee Novak who turns home, but the flag was up. Offside.

Image source, Getty Images

Danny Webber summarising on BBC Radio Manchester: "The next goal is big - it either puts the game to bed or puts it on a knife edge.

"Neither side has dealt with good crosses well at all. FC United, if they are to get back into the game, have to get the ball out wide and get crosses in."

We haven't got the full regalia of Opta's stats coverage tonight, but on my estimation one in about six of FC United's crosses has found their man. 

Here's another one drilled in and Chesterfield can only clear to the edge, but centre-back Luke Ashworth is probably one of the last men you'd put there to meet it. 

His scuffed shot is deflected, and from the corner it's another centre-back, Chris Lynch, whose header is easily collected. Huff and puff, but pretty tame.

This Rai Simons has certainly got bags of pace - here he is zipping down Chesterfield's left wing. 

The cross is no good though, it drifts into the packed-out terracing behind the net.

We really need a home goal here to spice it up. There's only so much a half-time bovril can give a man.

There's nothing doing though - Rory Patterson had that chance but slipped, and Chesterfield are growing...

And another one. FC United will be very happy to see the back of Sylvan Ebanks-Blake. He's replaced by Rai Simons. 

So-named, apparently, because his dad was a big fan of the former Brazil midfield wizard, Rai., external

That is some billing.

Image source, PA

Space opening up for FC United! But Rory Patterson fluffs his lines! He'll not want to watch that back. He slipped when brilliantly placed in the box. 

Then a change for Chesterfield sees Chris Herd come off, Ollie Banks - formerly of FC United - comes on.

Buoyed on by that little spell, the home fans have broken out into a little ditty based on Dirty Old Town by Ewan MacColl - you might know the Pogues' version better. 

If you missed it, John Cooper Clarke's profile of MacColl was pretty good on Radio 4 a while back...

Image source, Rex Features

Danny Webber summarising on BBC Radio Manchester: "FC United have brought Rory Patterson on to help Tom Greaves up top - and already you can see they have a more positive attitude."

"Dean Stott is also having more and more influence upon this game." 

These are encouraging signs for the home side immediately after the break.

Was there a handball in there as Chesterfield cleared the ball? Some of the home fans think there was - they're claiming it was a blue shirted arm that got in the way of a near-post cross. 

Then the mood falls flat though, as Dean Stott steps up with a horrible mis-kick as the corner's only cleared to the edge of the box.

Either way, if they're still struggling with 15 minutes to go. Expect more changes. 

They could always get this lad on!

Image source, REx

Here we go then, back under way. 

There have been two changes for the home side - Greg Daniels and Rory Patterson are on for Rory Fallon and Craig Lidfield. 

Can fresh legs bring the goals they need?

There's 78 league places between these two and it really showed in that first half. 

Can FC United sprinkle a little something of that FA Cup magic about in these next 45? There's still time for one last first-round shock...

A little reminder, too, that you can watch the goals from this game right now - and on this very page.

Just go ahead and click the Highlights tab. It's worth it for Lee Novak's alone.

Image source, .

Missed the second-round draw from earlier? No worries, we've got you covered. 

You can read all about who your team will play over here. 

The winner of this match gets Walsall at home. At the moment, it's only looking likely for one team.

Image source, .

Image source, .

Image source, Getty Images

Get involved using #bbcfacup, external on Twitter, text us on 81111, or post a comment on the BBC Sport Facebook page., external

A brilliant start from Chesterfield, scruffy for the rest. 

FC United have a lot to do if they're to bridge that gap.