July 10 : Argentina, Australia and England are all looking for their first wins in the new Nations Championship this Saturday after defeat on the opening weekend, while Scotland will be hoping for a breakthrough triumph.The competition awards points for each game, culminating in a November final at Twickenham between the top sides from the north and south, which leaves little room for setbacks.Argentina suffered a surprise home loss to Scotland in Cordoba last Saturday but, having had more time together, will be raring to get back on track against Wales in San Juan.Argentina's players come from clubs all around Europe, and initial preparations are traditionally not enough to get some rhythm and consistency going. They looked out of sorts against the Scots. Australia were edged out by Irela