While the postseason rolls on at the major league level, I was able to spend the past week at the Arizona Fall League getting a close look at some of the top prospects in the minor leagues.

The most impressive arm so far has been Jenrry Mejia of the New York Mets, who was on a short pitch count but showed two above-average pitches and a chance for a third. Mejia's fastball sat from 93-96 mph and touched 98, he also threw a plus changeup that looked more like a two-seamer at 85-87. It should be noted, though: the latter pitch was a little inconsistent. His curveball was even less consistent, but he threw one very sharp one for a called third strike at 78 mph, with good depth and clear two-plane break. He comes from a slot just below 3/4 and needs to focus on staying on top of the ball. He missed a chunk of the second half with a strained finger, which could impact how he grips the ball even now. He has a strong, thick build. The velocity comes easily, and if his command is better than what he showed on Wednesday and he can snap off that good curveball more frequently, he's a potential No. 1 or No. 2 starter.