WARREN Gatland says his Lions will be feeling the heat after they watched an inexperienced Wales beat Argentina on home soil with a mightily impressive performance in San Juan.

Wales will head to Santa Fe next week targeting a summer clean sweep after backing up their Washington win against South Africa with a first Test success against the Pumas.

At the Estadio del Bicenternario, first-half tries from James Davies and George North laid the platform for Wales' success as fly-half Rhys Patchell kicked 10 points.

A pack boasting just 81 caps between them stood firm against an experienced home front eight, scrummaging strongly and denying their hosts any go-forward in the driving lineout.

Gatland has given his Lions the summer off after their exertions in New Zealand and now has welcome selection problems in World Cup year.

"If we win three from three it will be exceptionally pleasing for this tour and the guys back home, some of the older and more experienced players, will be saying that there is a bit of competition coming through, which is exactly what we wanted," said the New Zealander.

"I think some of the boys sitting at home watching on TV have probably got a worse headache than I have!

"When you get a lot of competition, [absent] players are wanting the team to do well but not too well."

The Wales boss now wants his charges to finish the job with a clean sweep.

"We spoke in the changing rooms about being two from two and wanting to make a clean sweep of it," he said.

"It was a fantastic performance from the boys. We were under a bit of pressure in terms of territory and possession, but we knew how important our defensive display was going to be.

"The guys have trained well all week and they fronted up. That's what we asked of them and as a coaching team, you can't ask for any more than that. They put their bodies on the line.

"They gave it everything so it's a really pleasing performance for us."

"We feel like we're in a really good place at the moment and we're really looking forward to the next 12 to 14 months and on to Japan for the World Cup."

Cory Hill captained Wales for the first time and the Dragons lock, who was joined in action by regional teammates Elliot Dee, Hallam Amos and debutant Aaron Wainwright, hailed the physical effort.

"I am pretty pleased with that, we knew that it was going to be a tough challenge in front of a hostile crowd," said Hill.

"The boys really fronted up, especially the pack while Scott Williams and Hadleigh Parkes in the midfield held the defence together.

"We are pretty pleased but we've got to front up again and do the same job."

Wales will face Argentina in Santa Fe looking to clinch their first series victory in the land of the Pumas since 1999.

Their only concern is a minor hip knock suffered by James Davies. The Scarlets flanker was able to leave the stadium on foot but limped to Wales' team bus.

Argentina head coach Daniel Hourcade admitted his team had been outclassed.

"Wales beat us in defence and they deserved to win," he said.

"They were very good and if we do not win the contact or are better at the breakdown, we will suffer again next Saturday.

"We have to get to the ball first, beat Wales to the floor, and generate the momentum necessary to play the way the Pumas can play. We could not do that here."