Later today the host Americans face the monumental task of taking on Lionel Messi and Argentina in the semi-finals, and much of the Yanks strategy will be focused on trying to contain, or simply slow down the Barcelona standout.

Messi and Argentina trained Monday. The reigning world player of the year led his team to a 4-1 win over Venezuela on Saturday and the Albiceleste frontline are expected to continued the strong form they've shown so far at the tournament. And in the last four showdown against the US, Argentina's coach Gerardo Martino hopes the methods the hosts employ to contain Messi will be within the rules.

Compared to the star power of Argentina, USA will need to rely on teamwork to cope with their opponents. Jurgen Klinsmann's side beat Ecuador 2-1 in the quarter-finals to earn the right to play one of the world's best teams. The Americans have two wins, two draws and six losses overall against the Argentines. And with nothing to lose against the favourites, Klinsmann hopes his players will be brave and leave everything on the pitch.