Arsenal thrashed north London rivals Tottenham 5-0 at Emirates Stadium but Chelsea maintained their seven-point lead at the top of the WSL with a late 2-1 win over Everton.
Chloe Kelly marked her return to Arsenal by featuring in a crushing victory over Spurs in front of 56,784 fans.
Clare Hunt's 15th-minute own goal set Arsenal on their way and Mariona Caldentey added a second 10 minutes before half-time.
Frida Maanum and Alessia Russo doubled the hosts' lead before the hour mark and Emily Fox rounded off a big win in style with a spectacular fifth in the final minute.
Lauren James then scored a 93rd-minute winner as Chelsea battled from a goal down to beat Everton at Kingsmeadow.
Everton threatened to cause an upset when Kelly Gago burst down the left wing in the 51st minute and unleashed a fine effort into the top corner against the run of play.
But Sonia Bompastor's side rallied with Mayra Ramirez equalising just after the hour mark in what was the leaders' first real chance of note.
Everton looked good value for a point until the third minute of added time when James unleashed a long-range effort with her left foot that clipped the post and found the back of the net.
Arsenal are 10 points behind Chelsea in third place.
Second-placed Manchester United beat bottom club Crystal Palace 3-1 to seal their sixth straight win.
Additional reporting: Press Association
