DRAGONS wing Deon Smith says Wales' shock win against New Zealand means they will be confident but not cocky for their World Rugby U20 Championship finale.

The Welsh youngsters stunned the Baby Blacks 8-7 in a dramatic encounter in Rosario on Monday, with a storm forcing an hour-long delay in the first half before fly-half Cai Evans nervelessly slotted a 79th-minute penalty.

Matching the exploits of the class of 2012 by beating New Zealand means that Wales will face England on Saturday (kick-off 2.30pm) in a play-off for fifth place in the tournament.

Gareth Williams' side are aiming to head home with a solitary defeat, to champions and finalists France, from their five fixtures.

Smith started his second game on the spin against New Zealand, moving from the left wing to the right to accommodate Scarlets speedster Ryan Conbeer, and then had to shift to midfield during the game.

The 19-year-old from Pontypool has relished being a key figure in such a notable win, but is confident the group will stay grounded to finish the job against the English.

"It's potentially a once-in-a-lifetime experience and we have created history, so we'll soak it all up," he said.

"We're all immensely proud of each other and shows how tight we are as a squad really."

"Luckily over the last season or so I've had some game time at centre, so it was just a case of slotting in and getting my roles clear," he added.

"We had to come out mentally ready to go again (after the break) and fair play, the boys delivered and reaped the rewards of a good shift.

"We've talked all tournament about the difference between confidence and cockiness and as a group of boys we are all down to earth, so we'll stay focussed and be ready to go again."

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Dragons scrum-half Dafydd Buckland has impressed after moving into the starting line-up because of Osprey Harri Morgan's illness and says that confidence is high.

"There's a great feeling in the squad in what were awful conditions," said the 18-year-old.

"I think the last time (Wales beat New Zealand) was seven ago, so it's unbelievable and I'm really proud of everyone.

"We've got England next, there's obviously a big rivalry, but it will be an interesting game and hopefully we can come out on top again."

The match was played in horrendous conditions with a storm leading to the players returning to the changing rooms after 28 minutes because of safety concerns, returning to the plastic pitch after over an hour.

"We had to regather, recuperate and then go back to perform for another 50 mins," said Buckland.

"Conditions didn't help the set piece. It was the same for both sides, with conditions not helping either side, but lineouts were difficult, when we are usually on the money, but we came out on top in the end."

England have responded to defeat to Ireland in their opening game by beating Italy, finalists Australia and then the Irish again.

Smith was the last-gasp hero when the sides met in Colwyn Bay in the Six Nations when he powered over for a try to sneak an 11-10 success.

Saturday fixtures: final - Australia v France, third-place play-off - Argentina v South Africa, fifth-place play-off - Wales v England, seventh-place play-off - New Zealand v Ireland, ninth place match - Italy v Georgia, relegation match - Scotland v Fiji.