It's been a pretty great season for top prospect call ups, even if all of them haven't hit so far. We've got another handful of potential impact players on the way, including the inevitable return of one of baseball's most talented young arms. Plus, we look at some high-potential players available on waivers, and look into whether some of this season's biggest breakouts are for real.

Jon Duplantier and Alex Reyes are looking like rotation options. Could Yordan Alvarez and Kyle Tucker soon be lineup options for the Astros?

The Astros are a good place to look for high-upside possibilities, but there are other waiver talents who can help your team immediately.

Here are five breakouts you should buy, and five more to be skeptical of, beginning with Lucas Giolito and Josh Bell living up to their potential.