An inspired display of power-hitting from the West Indies top order saw them beat Bangladesh by eight wickets in Sharjah.
Both teams came into the game on two points with two games remaining, knowing that victory was crucial to keeping their semi-final qualification hopes alive.
And West Indies captain Matthews showed why her side are such a dangerous proposition, peppering the boundary in an inspired 22-ball 34 that helped break the back of a chase of 104.
The captain and opening partner Stafanie Taylor put on 52 for the opening wicket before Matthews was cleaned up by Marufa Akter, with Taylor forced to retire hurt on 27.
But the power kept on coming, as Shemaine Campbelle hit 21 from 16, before the phenomenal Deandra Dottin slammed 19 from just 7 deliveries to wrap up the win in 12.5 overs.
WATCH: West Indies win it with a huge six
The margin and speed of the victory means that West Indies go top of Group B on NRR, while Bangladesh now require something close to a miracle if they are to progress from Group B.
Tasked with chasing down 104, Matthews and Taylor got West Indies off to a flier, giving themselves a few overs to bed in before unleashing a brutal display of hitting.
The pair found the boundary with increasing regularity through the powerplay, with Matthews hitting two fours off Nahida Akter in an 11-run over that sparked the acceleration, before putting her foot down with a trio of boundaries off Fahima Khatun’s fifth over.
WATCH: West Indies attack in the Powerplay
West Indies had halved the required total when Matthews’ marauding effort came to an abrupt end with her stumps castled by Marufa Akter, who let out a roar of celebration.
WATCH: Timber! Marufa gets the better of Matthews
The West Indies were hit with a setback that could have further-reaching implications when Taylor was forced to retire due to injury having posted 27 (29).
And Campbelle’s promising knock of 21 (16) came to an end when she charged Nahida Akter and was stumped well out of her ground.
But Deandra Dottin finished the job in style, just as she had done against Scotland, slamming two big sixes in her blistering 19* (7) as West Indies wrapped up the win with 7.1 overs to spare.
Earlier, West Indies captain Matthews won the toss and decided to have a bowl against Bangladesh at the Sharjah Cricket Stadium.
And an inspired stumping halted a strong start from the Bangladesh openers, as Shemaine Campbelle flashed over the bails after Shathi Rani (9) had overcommitted to a delivery from Karishma Ramharack.
Ramharack struck again to remove the dangerous-looking Dilara Akter, who was cleaned up on 19 (from 18 balls), with Bangladesh reaching 58/2 at the midway point of their innings.
WATCH: Alert Campbelle sends back Shathi with a fine stumping
Alert Campbelle sends back Shathi with a fine stumping | WT20WC 2024
Captain Nigar Sultana received a reprieve when it initially looked like she had been stumped, only for replays to show that the keeper’s gloves were not fully behind the stumps, meaning a no ball was given.
The law in question, Law 27.3.1, reads: "The wicket-keeper shall remain wholly behind the wicket at the striker’s end from the moment the ball comes into play until a ball delivered by the bowler touches the bat or person of the striker or passes the wicket at the striker’s end or the striker attempts a run."
WATCH: Stumping appeal turns into a no-ball
Stumping appeal turns into a no-ball | WT20WC 2024
Sultana played a key hand through the middle order, stabilising an innings that threatened to go off the rails when Afy Fletcher struck twice in two balls, dismissing Taj Nehar (1) before bowling Shorna Akter (0).
But West Indies finished well, with Sultana (39 from 44) being one of three wickets to fall at the death as Bangladesh missed out on a late flurry, ending on 103/8.
Ramharack’s 4/17 were the pick of the figures, with Fletcher bagging 2/25 and Matthews coming back strong after an expensive first over to finish with 1/19 having gone for just four runs off the final over of the innings.
The win for West Indies leaves three teams tied on four points at the top of Group B, with West Indies gaining a net run rate advantage over South Africa that could yet prove crucial depending on results in the remaining three matches in the group.
Bangladesh v South Africa – Saturday 12 October (18:00 local time), Dubai International Cricket Stadium
England v Scotland – Sunday 13 October (14:00 local time), Sharjah Cricket Stadium
England v West Indies – Tuesday 15 October (18:00 local time), Dubai International Cricket Stadium
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