Top 10 defensemen under 25

It's the hardest position for youngsters to play in the NHL; preternatural skill doesn't necessarily translate to success. Why? Defensemen must be physically mature, able to fend off behemoths along the boards and in front of the net. Successful defensemen must be smart, decisive and quick to act, whether simply chipping the puck out of their zone or pinching to keep an offensive chance alive. Blueliners almost always need experience.