New Zealand scorched Toa Samoa in the second half to run out 38-8 winners in its opening Rugby League World Cup match in Auckland on Saturday night.

After holding a narrow 10-4 advantage at the end of a first half where they completed just half of their sets, the Kiwis scored five tries in the second period to clock a convincing result in the first game of Pool B.

While the final scoreline was convincing for coach David Kidwell's side, the journey to it was at times anything but, as they coughed up 17 errors and struggled to execute their offload-heavy plan.

Samoa will lament a second half where it repeatedly shot itself in the foot with errors coming out of yardage, while it appeared to struggle with the pace of the game when the Kiwis found second gear after the break.

The start couldn't have gone any better for the Kiwis, who were over via Jordan Rapana after just four minutes before a clever interchange of passing between Simon Mannering and Thomas Leuluai saw Shaun Johnson score and convert for a 10-0 lead.

The Samoans were creating turnovers off their swarming defence and had a couple of chances to register first-half points before Ken Maumalo went over with four minutes left, reducing the deficit to six.

Both Brad Takairangi and Isaac Liu grabbed tries on Test debut early in the second half, along with Kodi Nikorima's screaming run onto a Johnson grubber, to give the local side a 16-point advantage.

A long stoppage in play to take Gerard Beale from the field, after he collapsed away from contact with a suspected broken leg, did nothing to halt New Zealand's momentum and a short time later Nikorima turned provider to send Roger Tuivasa-Sheck through for a clear run to the line.

A spectacular effort from Nelson Asofa-Solomona saw him stretch out and become the third Kiwi to score on Test debut with nine minutes to go, before Samoa standoff Joseph Paulo dotted down after the siren to offer a slight positive for his side and finish the scoring at 38-8.

MATCH DETAILS

Mount Smart Stadium, Auckland

New Zealand Kiwis 38 (Jordan Rapana, Shaun Johnson, Brad Takairangi, Kodi Nikorima, Isaac Liu, Roger Tuivasa-Sheck, Nelson Asofa-Solomona tries; Shaun Johnson 5 conversions).

Toa Samoa 8 (Ken Maumalo, Joseph Paulo tries).

Halftime: 10-4 Kiwis.

Referee: James Child (England).

Crowd: 17,857.