Alex Doran, a 28-year-old corporate strategist, is cheering for the US national team and was pleasantly surprised by the size of its initial win against Paraguay last week, while acknowledging that his team is unlikely to go all the way. While he does not expect to attend a match in person involving tickets costing thousands of US dollars, he has been watching avidly online and hopes to see some matches at fan zones set up around Washington. “I’m a little uncomfortable with large crowds because...