Western Storm beat Southern Vipers by six wickets to win Super League title
England skipper Heather Knight hits unbeaten 78 to see them to victory
Danni Wyatt made 73 off 42 balls for the Vipers as they made 172-7 from 20 overs
Vipers earlier beat Loughborough Lightning in the semi-final
Competition will make way for The Hundred next year
Southern Vipers beat Loughborough Lightning to reach final
If you've just joined us and want to see how Southern Vipers reached the Super League final, you can see highlights of the semi-final below.
Vipers all-rounder Suzie Bates was particularly impressive, as Loughborough Lightning were edged out by five wickets.
Western Storm v Southern Vipers (play starts 16:00)
Image source, Rex FeaturesSouthern Vipers skipper Tammy Beaumont has won the toss and they will bat first.
"We don't mind too much. Over the past couple of years we've chased brilliantly," says opposite number Heather Knight, whose side won nine of their 10 group games.
Vipers keep faith with the XI that saw off Loughborough Lightning, while Storm are also unchanged despite a defeat by Yorkshire Diamonds in the their previous match.
Western Storm: Priest, Mandhana, Knight (c), Wilson, Luff, Sharma, Dattani, Shrubsole, Davies, Nicholas, Odedra.
Southern Vipers:Wyatt, Bates, Beaumont (c), Bouchier, Wellington, Kelly, Scholfield, Morris, Farrant, Rudd, Bell.
Only a few minutes to go before captains Heather Knight and Tammy Beaumont will be tossing up ahead of the final. The odds are on whoever wins batting first - but sometimes surprising decisions are taken....we'll have news of events out in the middle when it happens.
Image source, Rex FeaturesSurrey Stars were crowned Women's Super League champions for the first time last year with a 66-run win against Loughborough.
Lizelle Lee scored a stunning century in the final at Hove, hitting 104 off 58 balls in her maiden Super League and sharing a 111-run partnership for the third wicket with Surrey captain Nat Sciver.
Sciver was player of the match in Surrey’s semi-final victory against holders Western Storm.
Loughborough automatically qualified for the final by topping the group stage, but were hampered by an arm injury to big-hitting all-rounder Sophie Devine and were dismissed for just 117.
Image source, Rex FeaturesWestern Storm clinched the Super League title in 2017 as Rachel Priest's 72 steered them to a seven-wicket win over the inaugural champions Southern Vipers.
Stafanie Taylor took three wickets in seven balls but Hayley Matthews and Mignon du Preez both made 31 as the Vipers posted 145-5.
Tension was added for Storm as Taylor was forced to bat with a runner after suffering a hamstring injury while bowling but she finished the match in style with a huge six with 12 balls to spare.
Immediately after the match, Southern Vipers and former England captain Charlotte Edwards announced her retirement from professional cricket.
Only one match to go and the Women's Super League will be history, with The Hundred set to transform English cricket with all the bells and whistles and fireworks you could possibly wish to see. But will it be Southern Vipers or Western Storm who will lift the SL trophy? Let us know how you see the final progressing by tweeting to #bbccricket.
Image source, Rex FeaturesSouthern Vipers claimed the first Super League title in 2016 after a seven-wicket win over Western Storm.
Former England captain Charlotte Edwards shared a 78-run partnership for the first wicket with Suzie Bates which saw the Vipers chase down 141.
Despite playing no professional cricket since 2014 prior to the Super League, Arran Brindle continued her impressive form in the competition, having Heather Knight caught at square leg.
Despite a middle-order wobble, seasoned internationals Sara McGlashan and Lydia Greenway powered the Vipers home with seven balls left at Chelmsford.
So the Women's Super League will end as it began with a final between Southern Vipers and Western Storm.
There will be plenty of England players on show with Tammy Beaumont, Danni Wyatt and Tash Farrant for the Vipers pitted against the likes of national team skipper Heather Knight, Anya Shrubsole and Fran Wilson in the Western Storm side.
Here are a few of the key moments as Southern Vipers beat Loughborough Lightning to go through to face Western Storm in a repeat of the 2016 and 2017 finals.
Southern Vipers beat Loughborough Lightning to reach final
Quote MessageThe way we bowled and batted in the powerplay was probably the difference. When we were able to keep them under 150 it made a real difference. I think it's a really good cricket wicket - Western Storm have been a quality cricket outfit so we know we'll have to be at our best
Suzie Bates, Southern Vipers all-rounder on Sky Sports
Southern Vipers beat Loughborough Lightning to reach final
Quote MessageThere were key moments where momentum shifted and we were on the wrong side of that too many times. I'm really proud of the girls, we fought back really well - the fight we've showed, it's a pleasure to captain them
Georgia Elwiss, Loughborough captain on Sky Sports
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Southern Vipers beat Loughborough Lightning to reach final
Quote MessageI'm really delighted - I asked the girls to commit to their plans and front up in the field. I think that's our best bowling and fielding performance in the competition.
Tammy Beaumont, Southern Vipers captain on Sky Sports
Charlotte Edwards
Ex-England captain on BBC 5 Live Sports Extra
I think we are in for a good final. Over the four years, I think these two teams have been the most consistent.
Southern Vipers beat Loughborough Lightning to reach final
Standby for some reaction to that thrilling semi-final...
Loughborough Lightning 143 Southern Vipers 145-5
A boundary apiece from Amanda Wellington and Paige Scholfield in the penultimate over is enough to take Southern Vipers over the line in what proved to be a really close run-chase.
They held their nerve there, with the match seeming destined for a final over showdown.
Vipers will face Western Storm in the last ever Super League final later, but Loughborough Lightning played their part in a fine semi-final.
Wellington 13, Scholfield 6
Mignon du Preez drops Amanda Wellington at midwicket - it was a tough one but how vital could that be?
Southern Vipers need nine runs from 12 balls now, they're doing enough to keep their heads above water with these singles.
Sarah Glenn to bowl the penultimate over for Lightning, and it needs to be a belter.
Wellington 11, Scholfield 4
Five runs from the 17th over, which is just about enough to keep Southern Vipers in the driving seat.
But Amanda Wellington and Paige Scholfield lack the power of the higher order batters when it comes to getting the boundaries needed to make this a formality.
Loughborough still have a sniff, for sure.
Wellignton 9, Scholfield 1
Paige Scholfield gets a single off her first ball, which brings up 16 overs.
Vipers need 20 from 24 balls - not as simple as it looks in the circumstances, I would say...
Morris b Elwiss 7 (Vipers 123-5)
Fi Morris misreads a Georgia Elwiss delivery - moving to the off side - and sees her bails come off.
She goes for seven with Vipers 123-5 and needing another 21 runs to reach the final.
Paige Scholfield next in.
Morris 7, Wellington 3
Five dot balls for Loughborough bowler Kirstie Gordon heaps some pressure onto Vipers batter Fi Morris, who sweeps the final ball of the over for two.
It's now 28 from 30 needed for Vipers - this really isn't over!