After a respectable showing at the U20 World Cup, the natural speculation became who in the 21-man U.S. roster could make the next step up to the national team. Excluding Gaga Slonina, Caleb Wiley, Cade Cowell, and Jonathan Gomez, who have already earned a senior national team cap, here are five players who could take the step up based on their qualities and performances at the U20 World Cup.