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World winners New Zealand stretched out to a comprehensive winning margin over Namibia, but just following the underdogs had held up them using a first-half screen that was brave.
With 35 minutes Namibia were in one point of those winners.
However, the All Blacks have been in disposition from the second half, finishing with 11 attempts.
Pool B will be topped by new Zealand if they beat Italy next week.
That would set up a quarter-final from the runners-up of Pool A, which is down to a fight between Japan, Ireland and Scotland.
Expectations of a New Zealand rout were confused as the lowest-ranked side in the tournament, Namibia, showed no sign of being calmed by the possibility of taking on the world number one aspect.
To the joy of Welsh coach Phil Davies, the underdogs watched the first points of the match from out wide as Damian Stevens acquired a penalty.
In addition to a quick defensive lineup and a decision to get involved with the breakdown, Namibia revealed incisive lines and some palms to produce incursions in the All Black defence.
Hooker Torsten van Jaarsveld headed the way because they remained prop Angus Taavao and full-back Ben Smith went over just before the break to give New Zealand a comfortable 15-point cushion at the break.
New Zealand coach Steve Hansen, who gave his intended outing since suffering a shoulder injury in July, in his very first appearance to Brodie Retallick, seemed to fire his negative up .
Prop Joe Moody proceeded inside 2 minutes of the resume, the first of seven attempts as New Zealand pared their game down to principles.
TJ Perenara spared the rating that was ideal for last as he and offloads were exchanged by replacement Brad Weber – Webers becoming a behind-the-back pass – before diving into the corner. A packaged Tokyo Stadium stood to pay tribute following an experience.
New Zealand coach Steve Hansen:The first half was fairly unsatisfactory. We did not develop with the right mindset and Namibia made us pay for that. Its a lesson?
Second , there was pretty great stuff in it. I was very delighted with Jordie Barrett at 10, (that he ) played very, very well.
To be the third-choice first-five (fly-half), and also both superstar first-fives not playing… He got us round the trunk nicely. We finished up scoring (eleven) tries so there is a lot to like about it.
It didnt happen in the first half since we had a poor attitude. Theyd more intent than people and played better than us at the first half.
Namibia coach Phil Davies:We were just happy that what we spoke about before the match we were actually doing on the field against the best staff on earth. So we are really delighted.
The scoreboards not very pretty in the ending but the energy and the dedication… so proud of the players with how we tried to perform and certain things that we really did, which is pleasing.
New Zealand: Smith Goodhue, Lienert-Brown, Bridge; J Barrett, Smith; Moody, Taylor, Laulala, Retallick, Whitelock Cane, Savea.
Replacements: Coles, Tuungafasi, Taavao Todd Perenara, Ioane.
Namibia: Tromp Newman, Deysel, Greyling; Kisting, Stevens; Rademeyer, Van Jaarsveld, De Klerk, Van Lill, Uanivi, GaosebVenter.
Replacements: Nortje, Theron, Coetzee, Retief, Booysen, Jantjies, De La Harpe
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