Chelsea overcame Tottenham for the second time in five days to extend their lead at the top of the Women's Super League to four points.
Beth England continued her fine recent form by heading in the opener from Jonna Andersson's cross.
Spurs levelled against the run of play through Kerys Harrop's free header, but the Blues hit back immediately with Sam Kerr calmly restoring their lead.
Erin Cuthbert hit the post as the hosts missed chances to settle their nerves.
Emma Hayes' side, who have played a game more than their title rivals Arsenal, will be certain of a third consecutive league title if they win their final two games.
Kerr told Sky Sports she was spurred on to score the winner by "built-up anger and adrenaline" at conceding to Spurs just before the interval.
She said that her team had to "dig deep" to claim the victory, adding: "They've taken big points off big clubs this year so we knew it wasn't going to be easy.
"They're a good team so it does feel like a good three points but any win is an important win now - there are two games to go and we're just going to grind through. If we get all six points we're champions."
These two sides met on Sunday with Chelsea claiming a 3-1 victory despite playing much of the match with 10 players.
Against 11 away from home, Spurs put up another strong fight, and for a brief period in the second half caused numerous problems through Australia forward Kyah Simon.
But Chelsea's quality shone through, and they crucially held firm to retain the advantage in the title race.
"The win is all that matters, and no-one remembers the performances come the end of the season, it's the result that counts," Blues manager Hayes told Sky Sports.
"When it's 2-1 of course the opposition is still in the game but you just have to try and see it out and I thought we did that."
They will be overwhelming favourites against bottom side Birmingham City on Sunday, but do face a tricky home match against Champions League-chasing Manchester United on the final day.
"There are two games to go. We've got to get fresh for Birmingham because we've played some hard football these last two games," added Hayes.
The title could already be won by then if Spurs do Chelsea a favour and beat Arsenal next Wednesday.
Before that match Tottenham face Everton at Walton Hall Park on Sunday.