Dominik Livaković
This guy is basically Croatia's last line of defense, and he's really, really good at his job—he's got lightning-fast reflexes and an almost supernatural ability to read what opposing players are about to do. At the World Cup, he matters because Croatia actually made it to the final in 2018, so they're back to compete for real, and a lot of their chances depend on him keeping the ball out of the net when things get tense. What you should watch for is how calm he stays during penalty kicks—he's got a knack for getting in attackers' heads and sometimes guessing which way they'll shoot, which can totally shift momentum in a crucial game.