Duffy four-for leads NZ to 3-1 series win in helpful conditions in Dunedin

"A beautiful summer's day," Jacob Duffy said as the tree tops and the cloud cover exchanged high-fives and the temperature just about strayed out of single digits. Dunedin was a picture postcard, provided you were a fast bowler.

The West Indies players in the dugout were all bundled up. Those that ventured into the middle were just bundled out. Duffy finished with 4 for 35, and in the process became the third-fastest New Zealand bowler to 50 T20I wickets and the primary force that led his team to a 3-1 series win.

West Indies were put in and bowled out for 140, having lost four wickets in 11 balls in the powerplay. A batting line-up that was focused on making the most of the field restrictions was undone on a pitch with live grass, so in addition to the overheads that almost ensured swing, there was pace and bounce.

Duffy harnessed all that help in the third over when he dismissed Shai Hope (top-edging a pull), Ackeem Auguste (bowled by the ball moving in late) and Sherfane Rutherford (caught behind trying to charge him).

The first of those wickets took Duffy's T20I tally to 50. This was his 38th match. Only Trent Boult (36) and Lockie Ferguson (37) have got there quicker. One of the Southland's own now sits among New Zealand's elite.

His spell on Thursday also left Duffy with a strike rate of 13.8, the very best among the 20 Black Caps bowlers with at least 20 T20I wickets, and an average of 17.05, the second-best of that same group.

West Indies have a long and powerful batting line-up. Over the course of this series, they've added 277 runs at a strike rate of 176 after going six down. So emerging from the powerplay at 47 for 4 wasn't exactly the end of the world.

But there was a tipping point when Rovman Powell, who threatened an incredible rearguard just last week by helping his side recover from 93 for 6 to get within touching distance of a 208-run target, fell in the seventh over.

Roston Chase and Jason Holder eventually conceded to discretion being the better part of valour, putting on a partnership of 42 in 34 balls. But both set batters fell within five balls of each other and Matthew Forde joined them soon enough, leaving the score 94 for 8 in the 14th over.

West Indies tried. They tried to plug the leak but all they did - on land reclaimed from a lake in old Pelichet Bay - was sink.

New Zealand had their own trials as the ball kept jagging around all day. But with the target as modest as the boundaries either side square of the wicket - 63m each - the jeopardy was reduced.

Tim Robinson came out and nailed his Brendon McCullum impression, right down to the cock of the wrist just as the bowler releases the ball and the addiction to hitting up in the air. He made 45 in 24 balls with five fours and three sixes, though the shot of the day belonged to Romario Shepherd, who first cleared long-on, then the stands, and almost what remains of the old Dunedin art gallery.

Devon Conway was content to go at a slower pace, bringing up 1000 T20I runs at home, and eventually sealing victory with eight wickets and 26 balls to spare.