Arsenal kept on track for the treble with a 4-0 win at Liverpool in the Continental Cup quarter-final.
Having already won the Super League and FA Cupthe Gunners are now odds-on to add the final piece of the jigsaw.
They will be joined in the semi-finals by WSL runners-up Birmingham City, Everton and Lincoln.
Birmingham won 4-0 at Doncaster Belles, Everton beat Chelsea 4-0 and Lincoln won 2-1 at 10-woman Bristol Academy, who had Jade Radburn sent off.
Liverpool 0-4 Arsenal
Substitute Ciara Grant headed Arsenal in front from a ninth-minute Kim Little corner.
Grant had replaced captain Faye White, who pulled up with a knee injury and could be a doubt for England's Euro 2013 qualifier against Serbia on 17 September.
Striker Ellen White twice went close to increasing the lead as the visitors bossed the first half.
But they were lucky just before half-time when goalkeeper Rebecca Spencer allowed Katie Brusell's shot to slip through her hands.
The ball appeared to have crossed the line and there were massive appeals from the Liverpool players for a goal, but referee Natalie Walker ruled in Arsenal's favour.
Eight minutes after the break the Gunners edged further in front through Ellen White, who raced on to a Jordan Nobbs pass to drive an angled shot just inside the far post.
And 12 minutes later it was game over as substitute Jennifer Beattie tapped in from close range following a fine run and pass by striker Danielle Carter.
Beattie grabbed her second goal a minute from time, again with a simple finish from inside the six-yard box.
Doncaster Rovers Belles 0-4 Birmingham City
Striker Rachel Williams hit a hat-trick as Birmingham comfortably went through to the last four.
The WSL's leading scorer, with 14 goals in as many appearances, headed Blues into the lead from Jo Potter's 15th minute cross.
Williams doubled her tally four minutes from half-time, taking the ball around goalkeeper Mary Earps to score.
And the former Doncaster player completed her hat-trick with a penalty a minute into the second half.
Striker Jodie Taylor wrapped up victory with a 79th minute header.
Chelsea 0-4 Everton
Midfielder Gwennan Harries opened the scoring with a far-post finish from winger Toni Duggan's third-minute cross.
Striker Natasha Dowie added the second goal just before the half-hour, gliding past goalkeeper Sarah Quantrill to slide the ball home.
Midfielder Fara Williams hit the killer third goal direct from a 64th-minute corner.
And six minutes later midfielder Michelle Hinnigan completed the scoring with a close-range strike following a good run and cross by Dowie.
Bristol Academy 1-2 Lincoln
Winger Jess Clarke put Lincoln ahead in the 41st minute, forcing in a close-range shot from central defender Casey Stoney's cross.
The home side hit back to equalise in first-half stoppage time, midfielder Anouk Hoogendijk setting up fellow midfielder Jess Fishlock to score from 12 yards.
Radburn saw red for a foul on Clarke 15 minutes after the interval.
And Clarke, with her sixth goal in five games, punished the weakened home team when she hit the winner with a 20-yard lob 14 minutes from time.