Republic of Ireland goalkeeper Courtney Brosnan produced a superb performance as Everton ended Chelsea's 34-game unbeaten run in the Women's Super League with a shock 1-0 victory.
The Toffees arrived at Kingsmeadow third from bottom with just five points from nine games, while second-placed Chelsea were aiming to keep the pressure on leaders Manchester City.
Few would have predicted the three points would go to the Merseysiders, but that's how it transpired after Honoka Hayashi turned home a Toni Payne cross in the 12th minute for what proved to be the winner.
Everton withstood intense pressure, with Brosnan - who has recently returned to action after a knee injury - offering yet another reminder of her prowess between the sticks.
Brosnan made a string of good saves, with Chelsea's Sandy Baltimore hitting the bar at the the death as the Blues' 585-day streak without a loss came to an end.
Khadija Shaw scored a late double as Manchester City won 3-0 at Leicester to consolidate their place at the top.
Jamaica forward Shaw broke the deadlock in the 74th minute and struck her second nine minutes later before Brazilian substitute Kerolin added City's third in stoppage time.
City made it nine wins in 10 league games this season for their best-ever start to a WSL campaign.
Dominique Janssen fired a second-half winner as Manchester United beat West Ham 2-1 at Leigh Sports Village to climb back into the top three.
West Ham forward Shekiera Martinez's brilliant overhead kick early in the second period cancelled out Elisabeth Terland's first-half opener for United before Netherlands defender Janssen fired a 20-yard free-kick into the top corner.
Tottenham climbed level on points with fourth-placed Arsenal after Olivia Holdt's stoppage-time effort sealed a 2-1 home win against 10-player Aston Villa.
Villa defender Oceane Deslandes was sent off midway through the second half, before the visitors took the lead through Kirsty Hanson.
Tottenham hit back within a minute when Beth England glanced home a header and Norway winger Holdt fired the winner in the fifth minute of added time.
Japan forward Kiko Seike's early goal proved decisive as Brighton secured their fourth league win of the season, 1-0 at London City Lionesses.
