Why is a 34-year old right-hander on this list? Well, Junior Guerra won’t begin the season in the starting rotation. He’s transitioning into a bullpen role, and could become the break out reliever for 2019.
Guerra comes with a quality three-pitch mix that features a 93+ MPH fastball, a newly redesigned curveball, and a split-finger fastball as his ‘out’ pitch. He’s proven capable as a starter. As a one-inning reliever brought in to air it out? Guerra could dominate.
He figured out that his slider was getting him killed, and started using his newly rebuilt curveball as his his preferred breaking ball. Guerra posted a .266 wOBA against in a relief role down the stretch last year, and now he gets an entire off season to refine his arsenal.
Guerra will likely work in the sixth or seventh inning, and serve as a bridge to the late inning trio. The Milwaukee Brewers need him to succeed or they’ll have to find a replacement. Given the upgrades to his repertoire, Guerra should stick in the role, and he should find the success that the team believes he’ll provide.