Beth England and Sam Kerr each netted braces as Chelsea returned to the Women's Super League summit with a 5-0 victory over Reading at Kingsmeadow.
Strikes from Jessie Fleming and England just before and shortly after the break put the hosts two goals up, and Kerr then scored twice from close range, in the 66th and 77th minutes. England subsequently completed the rout with a penalty in stoppage time.
The champions move back to the top, a point clear of Arsenal, with both teams having four more games to play.
Arsenal had earlier briefly reclaimed top spot via a 5-0 victory of their own over Leicester at the King Power Stadium, where Vivianne Miedema scored twice.