Playing defense in the NHL takes incredible know-how and skill.
While young and explosive forwards may be able to make the NHL shortly after they are drafted, it usually takes defensemen a bit longer to make it at the highest level.
The Boston Bruins proved this point with the selection of Tyler Seguin in 2010 and Dougie Hamilton in 2011. Seguin was the No. 2 pick in the draft behind Taylor Hall. He had all the measurables as a high-scoring forward including speed, shooting talent and the ability to handle the puck. When he came to training camp in top shape and ready to show off those skills, he made the Bruins roster in 2010-11.
Hamilton was the No. 9 pick in the draft and he had the size, skating ability, puck-handling talent and shot to become an impact player. Despite those impressive skills, the Bruins let him play another year of junior hockey.
He will almost certainly make the team this year.
Here's a look at the players who will become the NHL's best defensemen in the next few years.