The Arizona Diamondbacks allowed Jhoulys Chacin to become a free agent, rather than risking arbitration with the pitcher. Chacin came up young, and in his first 148 innings in the majors blew away batters with 9.2 strikeouts per nine innings pitched. Chacin’s velocity started to dip after his rookie season, and his strikeout rate fell with it. In 2014, he avoided surgery for a rotator cuff injury, but his velocity and strikeout rate kept falling.

He didn’t show much of an improvement in strikeout rate in the minors in 2015, but he did at the major league level. Chacin either introduced or emphasized a cut fastball (depending on if you believe BIS or PITCHf/x), but either way he is doing something a pitcher losing velocity should do, find another way to upset the timing of the batter. He will be 28 in 2016, still in his prime. If he can perfect the cutter, and keep his slider intact, he might wind up a useful pitcher for some team looking for a fifth starter.