Winger Richard Johnson swooped for two tries as Wales sent seven-times winners Argentina crashing to defeat in their match at Bridgend last night.
Wales stormed into Thursday's semi-finals with a superb show of discipline against an Argentine team who lost their composure in a bitter match.
Wales, who beat England in the opening round, were always in control with out-half Ceri Sweeney kicking three penalty goals and a conversion.