New Zealand blew Canada away with a ruthless performance, scoring four tries in nine minutes at the start of the second half.
Nine-try New Zealand put Canada to the sword with a ruthless display, showing no mercy in Oita.
Even Beauden Barrett's standards can be improved by a sibling rivalry, according to Steve Hansen, as they prepare for Canada.
The Barrett siblings become just the second trio of brothers to start in a World Cup match after the Tongan Vunipola brothers in 1995.
New Zealand started their Rugby World Cup campaign impressively but Steve Hansen said: "There's plenty of stuff we can work on."
A penalty count heavily in their favour was key to securing New Zealand victory over South Africa, according to Rassie Erasmus.
Six minutes of first-half brilliance against South Africa underlined why New Zealand are Rugby World Cup favourites once again.
Kieran Read was delighted New Zealand took the opportunities presented to them by errors from South Africa in the Rugby World Cup opener.
South Africa started vibrantly but were put to the sword by New Zealand in an incredible first-half spell that changed the game.
Tom Brady knows a thing or two about winning and he is supporting South Africa at the Rugby World Cup.
Having been humbled by Japan in their 2015 Rugby World Cup opener, South Africa will be hoping for a much better start against New...
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Kieran Read says New Zealand know exactly what to expect from South Africa in Saturday's huge showdown in Yokohama.
Springboks boss Rassie Erasmus has sought to put pressure on Rugby World Cup referee Jerome Garces, says New Zealand coach Steve Hansen.
Beauden Barrett will start at full-back as the All Blacks named an experienced team for their meeting with South Africa.
Rassie Erasmus has named an unchanged side to face New Zealand in the Rugby World Cup and asked officials to treat South Africa fairly.
Ahead of the Rugby World Cup, three Omnisport writers take a look at the main talking points for the tournament in Japan.