Spirit easily beat Superchargers by seven wickets with 18 balls to spare
Rossington hits quickest Hundred fifty - off just 15 balls - before falling for 66
Superchargers post 143-5, with Du Plessis making 56 off 35 balls
Eoin Morgan's Spirit have now won all four of their matches
Glenn Maxwell says "he's hoped he's done enough in these four games to earn a contract next year" and "he'll be watching the remaining games keenly".
You can tell he's really enjoyed being a part of this London Spirit team and the tournament itself.
He absolutely loves the double headers aspect too. It really is a magnificent part of the competition.
It never felt like there was any doubt that London Spirit were going to win that game after the ridiculous start that they got from Adam Rossington.
The two worms never even got close.
Image source, BBC SportGlenn Maxwell is leaving London Spirit after this game to go on Australia duty.
He's signed off with an unbeaten 43 from 25 balls though. A good way to go.
He's going for tea with Alex Hartley and Kate Cross tomorrow, though. That will be lively.
Phil Tufnell
Former England spinner on BBC Two
They look a good unit don't they? They are on top of their game with most bases covered.
London Spirit go four from four.
They have absolutely battered Northern Superchargers by seven wickets with 18 balls remaining.
We thought 144 would be a challenging chase but Spirit have done it with consummate ease.
Brilliant bowling from Amanda-Jane Wellington and Mady Villiers is gone, Oval Invincibles are now 76-4.
A ripping leg break beat Villiers the ball before and Wellington followed it up with a googly, the ball skidded through to hit middle and leg. Fantastic bowling from the Southern Brave and Australia spinner.
The Invincibles need another 78 from 40 balls to win.
Need two from 20 balls
My days.
Glenn Maxwell gets down really early for a pre-meditated reverse sweep and Dwayne Bravo sees him do it.
He goes to the really loopy 70mph slower ball and Maxwell is basically sat on the floor, with his bat lay along the ground, as he turns it round the corner for a single.
Two to win.
Lawrence c Brook b Bravo 18 (Spirit 137-3)
A bit of light relief for Northern Superchargers and Dwayne Bravo.
Dan Lawrence looks to get London Spirit within one run of victory but just picks out Harry Brook on the boundary.
Spirit only need seven though.
Need seven from 25 balls
Tidy set from Dwayne Bravo, conceding just four runs.
He's going to continue.
Chris Green
Middlesex all-rounder on BBC Radio
Georgia Adams has been the destroyer this afternoon. Keeping the stumps in play and getting the natural variation of the wicket. Very impressive.
That is a huge wicket. The Invincibles are right on the back foot here.
Georgia Adams played her part with the bat and now she's doing a sterling job with the ball.
Having got rid of Lauren Winfield-Hill, she has now bowled Marizanne Kapp too. The South African smashed 19 from nine balls so Southern Brave will be very glad to see the back of her.
Oval Invincibles are 68-3 halfway through the chase, they need another 86 runs from 50 balls to win.
London Spirit head coach Trevor Bayliss is in the dugout, leaning back, leg up, having a laugh.
Life is going well for him at the moment.
They are close to going four from four in this year's tournament.
Need 11 from 30 balls
David Willey returns for Northern Superchargers and it is a tidy set of five, conceding just four runs.
We're going to have a strategic timeout with 11 runs needed. Quite why, I'm not sure.
Image source, BBC SportBang. Bang. Bang.
Adam Rossington was in a hurry.
Need 15 from 35 balls
Four more.
Adil Rashid's line and length hasn't been quite right this summer and that is the case today too.
He strays down the leg side and Dan Lawrence just helps it on its way.
Adil Rashid returns.
Adil Rashid is deposited about 15 rows back by Dan Lawrence.
It looks like London Spirit are batting on a different pitch.
Need 27 from 40 balls
Good stuff from Roelof van der Merwe this.
He stays on for a set of 10 deliveries and only concedes two runs from the second set of five.
It is probably all a little too late though.
Chris Green
Middlesex all-rounder on BBC Radio
That's what pressure can create.
Lauren Winfield-Hill was in good form but that is a fantastic bit of bowling from Adams. She got one that stopped and turned in the wicket. The perfect off-spinners delivery, hitting middle and leg.
One you dream of bowling as an off-spinner.
Southern Brave have just started to drag things back and with the run-rate dropping, Lauren Winfield-Hill departs.
The opener was trying to pull the ball away and get the Invincibles going again but Georgia Adams delivery turned and stayed a little low to crash into middle stump.
Invincibles are now 44-2, needing another 110 runs from 65 balls.
Need 29 from 45 balls
"Catchhhh itttt".
No.
Dan Lawrence completely miscues but it lands in the middle of nowhere.