MLB teams have been signing a number of their young stars to long-term extensions recently.
The Tampa Bay Rays did it with Matt Moore, and the San Francisco Giants recently signed Madison Bumgarner to a five-year extension. Other players such as Jon Niese and Carlos Santana have recently inked extensions as well.
When teams recognize that they have a player who could be a superstar, they want to sign him to a deal that covers his arbitration years and potentially buys out some of his free-agency years.
These deals seem like they are becoming a trend. Teams want to keep their homegrown talent, and this is a way to do it.
It is possible that we will see a number of young MLB stars sign extensions with their teams over the next year or two.