Here's the moment that separates the two sides at Meadow Park...

Image source, Rex Features

Image source, Rex Features

Will Fran Kirby's be the only goal we see this evening?

Chelsea almost kill off this game within seconds of the restart, as Drew Spence has time to shoot in the box, unchallenged, but her low drive is blocked by the legs of Sari van Veenendaal.

The Netherlands keeper makes another save moments later, pushing away Gemma Davison's fierce effort.

The hosts get the second half started.

Arsenal are making a double substitution at the break, bringing on a mixture of experience and youth.

England veteran Kelly Smith is coming on along with Nigeria winger Asisat Oshoala, replacing Spain duo Marta Corredera and Vicky Losada.

It is time for the second half. Can Arsenal Ladies turn this game around? Or will Chelsea maintain their 100% record for 2016?

It could be a fascinating weekend of Women's Super League One fixtures, with six more sides in action over the next few days.

On Saturday, Liverpool Ladies host Sunderland Ladies from 17:30 BST, with the visitors keen to bounce back after their disastrous 7-0 loss at Arsenal in the FA Cup.

Then on Sunday, Birmingham City Ladies host Manchester City Women at 14:00 BST, before Notts County Ladies host Reading Women at 17:00 BST.

Be sure to visit the BBC Sport website's Women's Football page to keep up to date.

Image source, The FA/Getty Images

As things stand, it is not going to be a good night for Arsenal Ladies' league title bid.

If they lose they will be three points behind both their main rivals already, having played a game more than both of them.

That might not sound like much, but in a season of just 16 league games each, it is hard to play catch-up.

Image source, Reuters

It's an Arsenal double-header this evening, with the Gunners' men's side in Premier League action shortly.

Follow live text commentary of their game against West Bromwich Albion at Emirates Stadium here.

Arsenal almost steal in for an equaliser right on the half-time whistle, as Chelsea keeper Hedvig Lindahl's skewed clearance only goes as far as Dan Carter on the edge of the area, but she hesitates to shoot and the Blues get defenders back in numbers to intervene and clear the danger.

The visitors will be very, very happy with that half-time scoreline.

We are into one minute of added time at the end of the first half. Chelsea are in control of things.

Gemma Davison looks in a confident mood now. She's got time on the ball and wants to take Arsenal players on. Right-back Alex Scott is going to have a busy night, trying to keep her at bay.

England's Jordan Nobbs concedes a free-kick, going in late on Chelsea's Claire Rafferty.

Ji So-Yun's delivery comes to nothing but, moments later, midfielder Drew Spence opens up space for a shot, but fires just wide from outside the box.

Chelsea's Gemma Davison sparks to life and does brilliantly to skip past two Arsenal players and into the penalty area, but she fires her shot over the crossbar from around 12 yards out.

That was a chance for the visitors, and a reminder of Davison's quality when she cuts inside from the touchline, one of her signature moves.

Chelsea's Fran Kirby looks for her second goal of the night, weaving in the area, but her low shot from a tight angle is straight at Sari van Veenendaal. Solid save.

Image source, The FA/Getty Images

Arsenal Ladies boss Pedro Martinez Losa was smiling pre-match but he looks slightly more pensive now, with his side behind.

The game has been fairly even though, with only that momentarily defensive slip costing the Gunners so far.

Nobody ever wants to fall behind, but it must feel especially significant when you're up against Chelsea Ladies.

Emma Hayes' side conceded just 10 goals in the league in 2015, the meanest defence in the WSL.

So Arsenal have a job on their hands tonight to turn this scoreline around.

Image source, Rex Features

Ouch. Jemma Rose's evening is getting worse as she clatters into Sari van Veenendaal while bravely defending a far-post cross. She looks hurt but is fine to continue.

Chelsea are causing the hosts some issues at the back, though, especially with Karen Carney's dangerous set-piece deliveries.

That is a real sickener for Arsenal. Jemma Rose and Sari van Veenendaal will both want to forget that moment as quickly as possible.

As for Fran Kirby, she will be delighted to score for the second big, big game running.

At the other end, Marta Corredera has a shot blocked after a good deep cross from Dan Carter.

Image source, The FA/Getty Images

All week, there has really been a sense around both clubs that this is a huge game, even at this very early stage in the season.

A defeat for Arsenal would be a big blow, having already lost at Man City, while Chelsea don't want to lose ground on the leaders either, having played a game less.

A draw would certainly suit Man City....and after nearly 15 minutes things are pretty even.