For a sport that relies so heavily on its long, proud tradition, baseball still finds itself in a constant state of change. What’s generally considered America’s grand old game is in the midst of trying to reinvent itself as a sport so it can appeal to a younger generation, while still keeping the soul that’s made it so popular for so long. Much of what we take for granted in the game now—instant replays, two wild cards, overly-dominant pitching—would have been unthinkable just a decade ago. What will the game look like a decade from now? These 10 people have had a big say in shaping that future.