How does a team follow up its best performance in the World Cup in nearly a century? For the U.S., preparing for its second group-stage game Friday against Australia has meant remembering when times were not so good. It was only seven months ago — the last time the U.S. played Australia. That match last fall was technically a non-counting friendly, but that didn’t lower the intensity of what became a physical contest as Australia challenged the U.S. from the start. Mauricio Pochettino, who was