Yahoo Sports reports: If anyone understands the power of participating in a World Cup at home, it is Mia Hamm. Hamm knows what it feels like when a stadium stops being just a venue and becomes part of the team. She knows how belief can build slowly, then all at once. And she knows that a tournament can become bigger than results. That is why, watching the U.S. men’s national team this summer, Hamm recognizes something familiar. “There was this incredible sense of positivity and hope and belief,” Hamm told The Athleti