For West Indies, in particular, this feels like a must-win contest. They could hardly have laid out a more emphatic marker than their 107 run win over Zimbabwe on Monday.  But, even allowing for that hefty NRR boost, a wounded India await as their final Super Eight fixture on Sunday. If that ends up being a straight knockout, then it’d be best to lay the killer blow here and now.

West Indies certainly have the form and the focus to do so. But, thrillingly, so do their opponents. In a tournament marked by reticence from a host of likely contenders, West Indies and South Africa have both been refreshingly route-one in their approach. Shimron Hetmyer’s 85 from 34 balls against Zimbabwe may have been the apogee of attacking batting in the tournament to date, but it was merely a continuation of the pedal-to-metal approach that enabled his team to out-muscle England by 13 sixes to six in their statement victory in Kolkata a fortnight ago.

South Africa, similarly, have not been backward in coming forward. India must have thought their last contest was in the bag when Jasprit Bumrah reprised his Barbados impact to reduce them to 20 for 3 after four overs at this same venue. They reckoned without a relentlessly aggressive middle order of Dewald Brevis, David Miller and Tristan Stubbs, who kept piling into the breach to produce a total of 187 for 7 that Marco Jansen soon proved to be more than enough to defend. A win on Thursday will almost certainly place South Africa in the semis, unless India lose all three games in the Super Eight.

More such bravery will be the requirement on Thursday. On a localised level, it’s thrilling to have such a high-stakes encounter at this stage of the competition. In reality, though, each of the tournament’s three likeliest winners would appear to have been crammed into the same under-sized pool. It’s sink-or-risk-being-sunk time at the Narendra Modi Stadium.

With 11 wickets at 12.18 – including eight in his last two outings, at this very venue, against New Zealand and India – Marco Jansen has the form and the method to make another statement impact for his team. Five of those wickets came in the powerplay – three against New Zealand, though they used his pace and bounce against him in between whiles, and two against India, who were never allowed to rally after his first-ball extraction of Tilak Varma. Every team craves a rangy left-arm seamer in this format, and Jansen’s combinations of angle, accuracy and steepling bounce mark him out as one of the very best.

Punch-drunk Sri Lanka never got up off the floor following that flurry of attacks. The first ball of the innings saw them lose their talisman Pathum Nissanka to Matt Henry’s  inswinger, and Charith Asalanka fell in his following over. In response, Sri Lanka retreated into their shell as New Zealand strangled them with spin.

Rachin Ravindra only had a part-time role in India but he was thrust in as the main character. He responded with two wickets in his first over and rounded out his spell with 4 for 19 – his best T20I figures. The game was long done even as it meandered to a dispiriting conclusion for a crowd that had shown its side it was ready to play its part. As Sri Lanka limped to 107 for 8, and out of the tournament, the team itself simply couldn’t keep up its end of the bargain.

It was a boomerang of a day for Maheesh Theekshana for the extremes it swung between. It began inauspiciously when he put down a diving catch of Tim Seifert at short third off the bowling of Dilshan Madushanka – and copped a spray from the bowler for his trouble.

The following over, Theekshana would make no such mistake off his own bowling, diving sharply forward to send Finn Allen packing. It began three sensational overs for the spinner as he engineered a New Zealand collapse, dismissing Ravindra and Mark Chapman within three balls of each other. At that stage, his figures read 3-0-9-3. However, New Zealand’s late counterattack sullied them somewhat, with the spinner unable to stem the run-flow as Santner took him apart for 21 in his last over.

New Zealand had the momentum at the halfway mark thanks to the Santner-McConchie stand, and Henry made sure it carried on uninterrupted. Off the first ball of the chase, he produced an unplayable inswinger that burst past Nissanka’s inside edge to knock off the top of the stumps. It was the start of a wicket-maiden, and that dagger already plunged, he returned for his second to take another wicket to open the over. This time, it was Charith Asalanka, a listless heave merely ballooning up in the infield.

To add insult to injury, McConchie and Santner returned to strangle Sri Lanka through half of the powerplay, their three overs inside the first six going for 14. It all combined for the hosts limping along to 20 for 2 in six, the lowest powerplay score all tournament.

New Zealand played most of this World Cup on the flat Chennai surfaces, but tonight’s bowling performance revealed their impressive flexibility. Coming to Colombo, they demonstrated they were fully prepared for slower, turning surfaces. McConchie was added in place of James Neesham to add bowling depth, with Ish Sodhi playing his first game of the tournament, not counting the Pakistan fixture that was washed out.

But it was Ravindra who epitomised New Zealand’s vast flexibility with a career-best performance, taking four wickets across his spell and carving the heart out of Sri Lanka’s middle order. All told, the visitors used five different spin options with only three overs of seam bowled all innings – the fewest for New Zealand in a completed T20I innings.

Brief scores:
New Zealand 168 for 7 in 20 overs (Finn Allen 23, Mitchell Santner 47, Rachin Ravindra 32, Glenn Phillips 18, Cole McConchie 31*; Dunith Wellalage 1-27, Maheesh Theekshana 3-30, Dushmantha Chameera 3-38) beat Sri Lanka 107 for 8 in 20 overs (Kusal Mendis 11, Pavan Rathnayaka 10, Kamindu Mendis 31, Dunith Wellalage 29; Rachin Ravindra 4-27, Matt Henry 2-03, Mitchell Santner 1-19, Glenn Phillips 1-21) by 61 runs

[Cricinfo]