Yahoo Sports reports: Although the cheers are still ringing in the Americans' ears after their impressive World Cup-opening victory, this U.S. team says it's prepared for the physical and mental challenges of the weeks ahead — including what's likely to be a physical meeting with Australia on Friday. Midfielder Sebastian Berhalter gives credit for this tenacity to coach Mauricio Pochettino, who has taken over a team that repeatedly flopped on the international stage and infused it with a stronger mentality grounded in a few core beliefs. “I think that’s something that (Pochettino) really put in,” Berhalter continued.