The top two goalscoring machines in the WSL go head to head this weekend as champions Arsenal go to Kingsmeadow to play Chelsea.

The two London clubs are firing on all cyclinders this campaign and last season were the two sides who conceded the fewest number of goals.

Ahead of this crucial fixture, we look at the strengths and weaknesses of both sides, and the corresponding fixture from last season, which ended in a resounding 5-0 victory for the Gunners.

Both teams attack in numbers

Over the course of the first three games of the season, both Arsenal and Chelsea have shown why they are likely to outscore every team in the WSL this time around as well.

Arsenal have had 50 shots at goal with a possession average of 68%, while Chelsea have had a remarkable 64 attempts on goal in their three matches and a possession average of 65%.

However, to date neither side has faced a team who finished in the top five of last season. But there is one common trait for both teams when they look to attack.

As can be seen in the pictures below, from Arsenal's opening win against West Ham and Cheslea's thrashing of Bristol City, both teams send a number of players forward when attacking. Chelsea have six players in attacking positions in the picture, while Arsenal have five.

This was a pattern repeated throughout the match and in their other fixtures to date. Tomorrow's encounter  is unlikely to see the sides bombing forward in such numbers, however.

But when they have the chance, it should not come as a surprise if they take their chances because of the options they both have in attack.

Defending from set-pieces and out wide is a concern for both

With impressive starts to the league season, it is difficult to pinpoint any weaknesses the sides have shown so far.

But one thing that has stood out on a few occasions from both sides is a susceptibility when defending from out wide or from corner-kicks. As seen in the two situations below, both Chelsea and Arsenal failed to keep their defensive shape.

They seem to get flustered when their opponents put passes in behind them. A possible reason for that is because these two often have so much possession of the ball, their players are not able to get back into position quickly enough to stop a cross coming into the box.

Both defences will be heavily tested because of the quality of the attacks on display and how they look to use their pace to run in behind defences. It will also be interesting to see whether they attack out wide, because of the culpability of both back lines.

Arsenal's hammering was a crucial turning point last year

At a similar point last season, Chelsea and Arsenal faced off at Kingsmeadow. Chelsea had not suffered a league defeat for more than two years at that point, yet they were humbled 5-0.

It was a devastating display by the Gunners, who did not necessarily dominate the match, but took their chances quite brilliantly and had a stroke of luck with Jordan Nobbs' cross- turned-shot going in.

Chelsea were in fact controlling the game in the second half and looked nailed on to make a comeback, but Arsenal caught them out and punished their mistakes.

It is unlikely to be a 5-0 thrashing again this weekend but Chelsea need to be aware that the champions have shown this tendency in the past year to perform at their best in the biggest of matches.