Calcutta: Mustafizur Rahman churned out one of his best performances, but then had to suffer the pain of witnessing his team crash to an embarrassing defeat.

Rahman really couldn't have done anything more. He produced a five-wicket haul (5/22) before a 20,000-odd turnout at the Eden on Saturday. But Bangladesh's World T20 campaign ended on a disappointing note on their Independence Day as they lost the match by 75 runs to New Zealand.

In reply to New Zealand's 145 for eight, Bangladesh put in one of their worst batting performances and were bundled out for a pathetic 70 in 15.4 overs. The appalling show beat their previous lowest total of 78, against the same opponents, back in 2010 in Hamilton.

Mentally, the Bangladesh batsmen just weren't there during the chase. Perhaps, the players are still in a state of shock for what happened on Wednesday night in their heartbreaking one-run loss to India. The lights of the High Court-end tower at the Eden went off after the 11th over in the second session and there was a 15-minute stoppage. It was just a co-incidence that Bangladesh's batting was similarly 'off', and it was for the entire duration of the match.

Bangladesh batting went completely wayward post Tamim Iqbal's run out. Colin Munro effected a brilliant direct hit to send back Tamim. Thereafter, the Bangladesh batsmen just came and went, as if they were making guest appearances at the crease.

For New Zealand, there couldn't have been a better way to finish the Super 10 stage after having made the semis already. Wrapping up the group phase with a massive win, New Zealand thus finished with an all-win record and certainly look to be the best prepared team ahead of the semis.

The Black Caps made a couple of changes in their XI, like resting Martin Guptill and bringing in Henry Nicholls who made his T20I debut, while Nathan McCullum came in for pacer Adam Milne.

Kane Williamson made the right call in opting to bat after winning the toss on a slow, sluggish wicket. Somehow the Black Caps laboured to 145 for eight, thanks to their captain's solid 42 and Munro's 35 runs.

The total could have been lesser had umpire Johan Cloete not turned down Shakib-Al Hasan's appeal against Munro early in the 10th over. That was plumb in front of the stumps.

Also, two relatively easy catches were put down, that of Ross Taylor and Luke Ronchi, which only went on to help New Zealand.

For a major part of their innings, New Zealand struggled to come to terms with the slowness of the wicket. Whenever Eden hosts an international game or an IPL tie, the curator says with conviction that a good, sporting wicket is on offer facilitating proper stroke-play.

But when the match gets starts, it hardly looks to be a pitch for strokeplay. That has more or less been the trend.

However, no taking away any credit from Mustafizur.

Yes, Guptill's absence from the New Zealand batting line-up was a factor. New Zealand missed the early thrust he provides at the top of the order. His replacement Nicholls lasted for just 11 balls as Mustafizur cut the ball back in to rattle the left-handed batsman's stumps.

Williamson at the other end played the game that suited the conditions perfectly. But even he found it difficult to get going against Mustafizur.

Tied down, Williamson tried for a scoop to break the shackles. But the delivery from Mustafizur was dead straight, castling the New Zealand captain's stumps as he missed the line completely.

But in a nutshell, it was New Zealand's day. In fact, it has been New Zealand's tournament so far.