In my Oct. 12 Arizona Fall League preview, I included a nonexhaustive list of relievers I was interested in seeing and getting a read on to see whether they could be closer prospects that fantasy players would be interested in. Now that I've seen each of them multiple times, here are my thoughts:
Jeremy Jeffress, Milwaukee Brewers: I've seen the 23-year-old former first-round pick at various points since his pro debut in 2006, and the one constant has been his ability to bring high-90s heat with seemingly little effort. The righty has touched 98 mph here in Arizona and generally has sat in the 94-96 mph range in most of his outings. That said, his secondary stuff is still a work in progress. His 77-78 mph curve has been below average, as its break generally has not been good, and I've seen it better in the past. His 87-89 mph straight changeup has been OK, and he has shown some feel for locating it when he's not slowing his arm. The bottom line is that he needs to repeat his delivery better. It's not a complicated delivery, so it's projectable that he can do so, but right now he's speeding it up and varying his release point. He has shown flashes of working his fastball on both halves of the plate, but repeating his delivery will improve his fastball command and make his curve more consistent, in addition to helping him throw more strikes.
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