Mike Maignan
This guy is basically the last line of defense for France's soccer team, and he's one of the best in the world at his job—he's got incredible reflexes and can make diving saves that seem almost superhuman. He matters huge at the World Cup because France is trying to win back-to-back championships, and a strong goalkeeper can be the difference between advancing and going home. If you watch the games, keep an eye out for his distribution (how he passes the ball out from the back), since modern goalkeepers basically function as an extra field player who helps start attacks. Plus, his calmness under pressure is pretty wild to observe—even when shots are flying at him, he looks like he's just doing his job.