Moises Ballesteros is one of the most precocious and gifted hitting prospects in the game, yet he also presents something of a development dilemma.

Jorge Polanco and Maikel Garcia continue to move up in the world, such that they've now bumped Eugenio Suarez and Royce Lewis from my top 12 at third base. I wrote earlier this week about how both Polanco and Garcia appear to have staying power. Meanwhile, it's not so hard to poke holes in Suarez and Lewis right now.

The Cubs are calling up intriguing prospect Moisés Ballesteros to replace injured outfielder Ian Happ, and Eric Samulski explains why the catcher/first baseman brings major offensive potential to Chicago.

One of the top prospects in the system is about to get closer to his dream with a golden opportunity to finally make it come true.

Of course, that doesn't mean Webb is likely to be the next man up for the Rangers – Chris Martin has been the team's best high-leverage reliever this season, but he had already pitched in a setup role before Jackson exited Monday.