First chance for the visitors after the break.

Ryan Trevitt hits a free-kick from around 30 yards out which is dipping but doesn't dip soon enough and ends up going harmlessly over the Cambridge bar.

Wrexham want to make a statement in the early stages of the second half - they aren't fading away.

Captain James McClean sends a ball through to Jay Rodriguez in the centre of goal but the forward's shot is denied by Cobblers keeper Nik Tzanev.

Half-time substitution made by Exeter boss Gary Caldwell.

Vincent Harper, who was booked in the first half, is replaced by Demetri Mitchell.

Wrexham and Grimsby are on course for away wins, while there are two games yet to see some goal action.

Is that going to change over the next 45 minutes?

It's time to get the second half under way in our four early kick-offs.

It's half-time in our early games - we'll have updates from 19 more from 15:00 GMT...

Image source, Rex Features

Image source, Rex Features

Image source, Rex Features

Mickey Walker
Former Doncaster Rovers director of football on BBC Radio Sheffield

Doncaster have not been able to break down the barriers that Grimsby have set.

In the first 20 minutes Rovers looked good, they were winning second balls, having shots, moving the ball quickly but since the formation change that has stopped.

All in all, Rovers need to be more positive moving forward.

John Tondeur
BBC Radio Humberside

Grimsby have done very well in this first half, they are good value for the lead.

It was an even first 20 minutes but as the half went on, Grimsby just got better.

Grimsby lead at the break through Justin Obikwu’s third goal in as many matches.

Fifth-placed Doncaster hope to end the day in the automatic promotion places but they have problems; beaten 5-2 by Chesterfield in their previous league match and now a goal down at home.

A big half-time team talk coming up here for boss Grant McCann. The Mariners are excellent away and have looked dangerous going forward.

No goals at Plough Lane but Salford's Jamie Jones has been the busier keeper.

As it stands, AFC Wimbledon are heading above second-placed Notts County - who aren't playing today - on goal difference.

Wrexham lead Northampton by two goals at the break, with the Cobblers unable to mount any kind of challenge on the promotion contenders.

A direct pass from keeper to front man gave Sam Smith the chance to score the opener before Ollie Rathbone tucked away a second just four minutes later.

Can Northampton come out fighting in the second or will the Red Dragons breeze through to a comprehensive win?

Half-time and it's goalless at the break.

Exeter started the game on the front foot and will look back at Ed Francis' chance early on as a moment that got away from them.

The hosts grew into the match, however, and Ryan Loft will be spending the break wondering how he didn't make it 1-0.

Excellent work from Josh Stokes presented him with the best chance of the half by quite some distance, but he was only able to head his effort wide from just six yards out.

A good ebb and flow to this one.

From the resulting free-kick, the visitors can't clear their lines and the ball lands at the feet of United striker Elias Kachunga but his left-footed strike goes wide of Nathan Bishop's goal.

It's finishing like that which is why United have struggled so much this season.

Northampton Town's Ben Perry is awarded a yellow card on a poor challenge on George Dobson.

Dobson is up and fine but it was a painful one and it drew some boos from the away crowd towards the Nottingham Forest loanee.

Soon after Vincent Harper's booking, Angus MacDonald is the second Exeter man in the book for grappling Josh Stokes.

That one looked a little harsh in truth.

Gary Caldwell's side still level though, with half-time approaching.

Image source, Rex Features

Exeter's Vincent Harper is the first man in the referee's notebook for a trip on Dan Barton.

The resulting free-kick on the right touchline comes to nothing.

Tom Biltcliffe
BBC Radio Sheffield

Obikwu with three goals in as many games, he just did not look like missing.

It has been coming, Doncaster have just been allowing Grimsby a bit of a hold onto this game, without really testing the goalkeeper, until now.

Northampton Town have made an early change.

Defender Jordan Willis is swapped out for Aaron McGowan.

Oh, big chance for the hosts to open the scoring!

Really good old-fashioned wing play from Josh Stokes, who gets to the byeline and stands a ball up for Ryan Loft who, from six yards, fluffs his lines and heads wide.

Meanwhile, Exeter keeper Joe Whitworth goes down and gets a bit of stick from Cambridge mascot Marvin the Moose - to which Whitworth sees the funny side of.

There are boos amongst the home stands as Wrexham keeper Mark Howard takes his time delivering a goal kick.

He's hesitating because team-mate Sam Smith is sorting out a small wound on the sidelines, leaving his side down a man.

It's hard to see how it will matter.

Northampton haven't asked a single question of the keeper so far.