HALLAM Amos believes Wales can thrive against Argentina tonight thanks to the pressure of playing for World Cup places.

The Dragons speedster lines up at full-back versus the Pumas in San Juan (kick-off 7.40pm, live on Channel 4) as Warren Gatland's men attempt to back up last weekend's win against South Africa.

Amos scored a try in Washington but gifted away another with an interception – "my net tries was zero and that was frustrating" – and knows he must take every chance that comes his way ahead of Japan 2019.

With Leigh Halfpenny and Liam Williams rested after last summer's Lions exertions, the 23-year-old from Cross Ash has got an opportunity in his favoured 15 jersey.

And the Dragon, who played in the 2015 World Cup and will win his 17th cap at the Estadio del Bicentenario, wants to make an impression on Gatland & Co.

"Leigh and Liam are world-class 15s and it's just about taking my opportunity," said Amos, who scored against Australia and Georgia in a strong autumn campaign only to suffer a pre-Six Nations ankle injury.

"It's good to get a run of games under my belt and hopefully I will show to the coaches that I am an option there long-term.

"These games are key for a lot of the players who aren't guaranteed first team spots, this tour is massive for us to put our names really in the frame for World Cup selection.

"That has been well documented in the media but has also been said within the squad.

"You can palpably feel that there is that pressure to perform if we want to put our names in the hat, but I think it's fair to say we all enjoy that pressure."

Slippery conditions in Washington did not encourage running rugby but Amos hopes that a dangerous set of three-quarters gets the chance to stretch their legs.

"We will want to play attacking rugby and have class operators in Scott Williams and Hadleigh Parkes [in midfield] while we back ourselves as a back three," said Amos, who is joined by wingers George North and Josh Adams.

"It wasn't the best or most exciting game to play in last week but hopefully we can get some good ball to play running rugby this time."

Wales are underdogs against a Pumas side that will profit from the Jaguares, who are enjoying a strong Super Rugby campaign, and raucous backing in the west of Argentina.

"I am sure it will be hostile but that's what they get when they come to Principality Stadium," said Amos. "When you get out there it's just a rugby pitch and you don't tend to notice the crowd too much.

"Argentina are strong side and with just having the one club in Super Rugby are used to playing with each other week in, week out.

"They will use that to their advantage and try to hit the ground running, so we just have to make sure we match them in that regard.

"Argentina have changed their style over the years and are one of the best sides in the world but we will be better prepared this weekend and will hopefully have ironed out a few mistakes."