Scotland defeated Argentina 21-19 with a late penalty to win three successive rugby Tests for the first time in two years.

Just as in June 2012, the Scots have won all three on the road.

Following wins over the US and Canada, Scotland produced the winning points late for the second straight match, with five-eighth Duncan Weir kicking a penalty from 40 metres in the 79th minute on Friday.

Scotland trailed by one at halftime and 19-10 with 10 minutes to go, and looked like wasting a considerable advantage in possession and in the set-pieces against the feisty second-string Pumas who ran Six Nations champion Ireland close, twice.

The Scots forsook makeable penalty shots for attacking lineouts around the hour mark, and blew both.

So when their scrum destroyed Argentina’s, Grant Gilchrist, their youngest captain in 18 years, directed Weir to kick the penalty.

He nailed the attempt from 45 metres to close the gap to six and renew Scotland’s hopes.

Moments later, they attacked from deep and channelled the ball down the left wing of Tommy Seymour, their best attacking player.

Seymour broke and sent in replacement halfback Henry Pyrgos. Weir couldn’t convert from the touchline but the gap was one with seven minutes left.

Argentina conceded the decisive penalty by joining a Scottish rolling maul from the side.

But the Pumas still gave themselves a chance to steal the win after the hooter, setting up five-eighth Nicolas Sanchez to attempt a drop goal from 35 metres.

But Sanchez, who left the game temporarily for suspected concussion, shot wide left.