There is some history between Thursday's rivals. The U.S. coach Jürgen Klinsmann is German. He coached the German team in the 2006 World Cup and is friends with their coach (his former assistant), and many players.
Two of the Americans were raised in Germany by German fathers, Right Back Fabian Johnson and Midfielder Jermaine Jones.
Fans say all these factors should lead to an exciting match.
"You could just see them progressing over the three games," said Efrain Aguirre, soccer player and Fan. "I think today when they go to Germany they're gonna hit their top scoring goals. I'm excited."
Soccer player and fan Jim Romaine added "I think they're gonna come out to win. They want to show the world we're strong enough to take Germany. You're not gonna go half way and say 'I think we could do it with this', you've gotta go all the way."
Germany beat the U.S. 1-0, but both teams will advance to the next round.