England 157 for 6 (Dunkley 44, Knight 43, Matthews 1-19) beat West Indies 140 for 8 (Williams 38, Dean 4-19) by 17 runs

England made three changes to their XI from the second T20I, bringing Nat Sciver, Amy Jones and Sophie Ecclestone in for Dani Wyatt, Katherine Brunt and Lauren Bell. West Indies, meanwhile, brought in Trishan Holder and Sheneta Grimmond.

Matthews helped West Indies start positively in the chase, but Aaliyah Alleyne's stay at the crease was short-lived, with Dean dismissing her for a five-ball 3. Dean then produced a double-wicket maiden in the eighth over, dismissing the well-set Matthews for 35 and Shemaine Campbelle for a duck. Rashada Williams and Holder tried to resurrect the innings with a 40-run stand but this time Ecclestone had the latter bowled to break their momentum. After Alice Davidson-Richards dismissed Fletcher for 6, Dean returned to pick her fourth wicket of the day, getting Kycia Knight bowled.

Ecclestone then removed Williams, West Indies' top scorer on the day, for 38. West Indies needed 22 off the last over but they could score just four runs, falling 17 short.

"The effort we've shown in the last two games, in particular this one is very pleasing," Walsh said after the match. "It's also good that we've got some youngsters around who are showing the fight. We're trying to create a different team culture and approach and learning is taking place all the time. It's a loss in terms of the series but I am pleased with what I am seeing with the bigger picture of what lies ahead for the tri-series [against South Africa and India] and [T20] World Cup."

The fourth and the fifth match of the series are scheduled to be played on December 18 and 22 respectively in Bridgetown.