Jackson, the 45th overall pick in 2010, transitioned to a full-time relief role in 2016. He was able to post a 3.69 ERA between Double-A and Triple-A despite issuing 32 free passes in just 46.1 innings, which speaks to his stuff -- he can dial up his fastball in the upper 90s with consistency. However, Jackson wasn't able to overpower major league hitters the same way, giving up 22 hits (including four homers) in 11.2 innings with Texas. He will try to earn a spot in the Atlanta bullpen in spring training.
Uehara ran into some troubles with the long ball in his final season in Boston, yielding 1.5 home runs per nine innings on the way to a 3.45 ERA, his worst season mark since his rookie year in 2009. Now 41 years old, Uehara has seen his velocity decline over the last few years and could be at the end of his tenure as an effective late-innings arm. He enters a deep Cubs bullpen with a clear closer in Wade Davis, so it's unlikely he gets a shot at a save anytime soon.
Wilson spent the last two seasons with High-A Bakersfield in the Mariners' organization. In 2016, he slashed just .226/.338/.375 in 435 plate appearances spread across 104 games. He did hit 13 home runs and add 49 RBI, but he had significant issues with strikeouts, striking out in 36.1 percent of his plate appearances last season. He'll likely begin next season in the lower levels of the minors.
The former first round pick has missed the last two seasons due to two Tommy John surgeries and has pitched just 42.2 minor league innings since being drafted in 2012. The Rays are betting on some of that potential he displayed prior to being drafted, but the 23-year-old has a lot of lost time to make up for. The first step is to regain full strength and get some work in within the lower levels of the minor leagues.
In an effort to make room on their roster for the newly-signed Mitch Moreland, Boston opted to designate Jerez for assignment. Jerez spent all of 2016 at Double-A Portland, where he threw for a 4.71 ERA and 1.54 WHIP over 40 games (65 innings).
The 25-year-old backstop slashed .227/.252/.361 with three homers and 15 RBI over 126 plate appearances at the big league level in 2016. Those numbers represented a notable improvement over his 2015 cup of coffee, which consisted of a scant 35 plate appearances and saw Maile generate a .171/.171/.257 line. With Ramos not expected back until late May at the earliest, Maile figures to see a decent amount of playing time while platooning with Casali to open the season, with his exact role after Ramos' return likely to be largely predicated on how he acquits himself during that period.
Despite slashing .186/.273/.336 over 256 plate appearances last season at the big league level, Casali displayed a knack for making it count when he did make contact, rapping out 18 extra-base hits (10 homers) and tallying 25 RBI. His bloated 32 percent strikeout rate certainly needs improvement, but Casali's solid work behind the plate and occasional pop is likely to keep him involved even after Ramos is healthy enough to play, which is likely to be in late May or early June. In the interim, he figures to platoon with Luke Maile to begin the 2017 campaign.
Sanchez has been putting in the extra work at the Jays' Dunedin complex. Through the workouts, the 24-year-old has reportedly improved his vertical jump, range of motion and power. Sanchez put in similar efforts last offseason, and that was rewarded with a career year in 2016 that ended with a seventh-place finish in the AL Cy Young voting.
After bringing back Carlos Gomez, the Rangers have their outfield alignment pretty well set for 2017. He spent most of 2016 at Triple-A Round Rock, hitting .269 with 16 home runs and 18 steals in 100 games. Hoying should once again offer organizational depth, capable of playing center field should a need arise.
Puello is not without prospect pedigree, as he was one of the top players in the Mets' system back in 2013 before he was suspended for his ties to the Biogenesis clinic. Since then, however, he has failed to produce at a solid clip relative to his level. He hit .283/.413/.404 with five home runs and 18 steals in 78 games for the Yankees' Triple-A affiliate last year, but at 25, those numbers are a lot less impressive. Look for him to provide organizational outfield depth at the Triple-A level.