The world champions' head coach knows that tapping into emotion is the best way to get the most out of Lionel Messi and co.

Dismissing critics who question the 39-year-old's stamina, the Argentina head coach demands a legacy of passion and relentless grit in Kansas City as the holders chase history.

DALLAS, July 13 : Lionel Scaloni barely registered among the coaching royalty gathered in Bilbao.Brazil’s Tite drew the crowds to the International Football Summit. Fabio Capello,…