Previewing the World Cup's round of 16: Who's in, who's out and storylines to watch

Japan played like they can beat anyone (and they did, topping both Spain and Germany). Brazil is still the favorite to win it all, even as they wait to see if their star striker Neymar can return from injury. And the U.S., led by team captain Tyler Adams, has looked better than expected. (Jewel Samad/AFP/Getty Images; Fabrice Coffrini/AFP/Getty Images; Patrick T. Fallon/AFP/Getty Images)

This year's World Cup has already been a soccer spectacle: Steamrolls, upsets, dramatic goals, penalty kicks, pelvic contusions, tears of joy, tears of devastation, mere millimeters of shoulder and soccer ball making all the difference between elimination and ecstasy.

And that was just the group stage.