Shock wins and surprise margins are making for an exciting first few days for the Rugby World Cup.

The TAB offered a million dollars to a punter who could successfully guess the winner of every game in the tournament.

But none of the 48,000 people who took part are still in the running for the big prize.

Only one punter successfully predicted the shock Japan victory over the Springboks.

TAB's Mark Stafford said it shows how this World Cup has been full of upsets and surprising results from day one.

"We've seen some tremendous games, the Georgia - Tonga one, South Africa vs Japan, but even Fiji gave England a decent old run."

Mark Stafford said since the Japan result, "we have seen a bit of interest in the underdogs as well, we did see some money for the Argentinians."

All Blacks fans aren't taking anything for granted after yesterday’s narrow escape against Argentina.

The ABs won the game 26 - 16 but a defeat looked like a real possibility in the first half.

Stafford said betters are no longer willing to put their money on New Zealanders winning by a margin of 12 points or more.

“All Blacks putters have moved away from the 13 and over mark to the 12 and under mark thinking ‘these minnows might be ok’,” he said.

New Zealand’s next match is against Namibia on Friday morning.