Mike Zarrilli/Getty Images
Mike Trout and Bryce Harper would never find themselves within a thousand miles of a list like this. It's easy to forget, but that's who Jason Heyward was just two short years ago.
Heyward had the world at his feet after a stellar rookie season, but unfortunately, a debilitating shoulder injury prevented him from picking it up and running with it.
He's been better this year, but much of his early-season value came from a surprising increase in speed. Now that that's gone (Heyward has stolen one base since May 5), his value is once again dependent on his power production, which to this point has been less than impressive.
A quick look at his batted-ball results puts that worry to rest.
Heyward's shoulder seems to be healthy. He has finally been able to consistently drive the ball, hitting more line drives and more fly balls than ever before and cutting his ground-ball rate by nearly 30 percent.
While it's produced just eight home runs on the season, his .088 BABIP on fly balls ranks among the worst in baseball. A home run/fly ball rate that sits nearly three points below his career average will certainly improve as the year goes along.
As the weather heats up and Heyward's luck turns, he'll deliver top-30 value at his position, even if his speed continues to dissipate.