Johnson's been lit up lately, giving up seven earned runs over his last 5.1 innings (11.81 ERA), which is a likely reason why Seattle is sending him on assignment. In corresponding roster moves, Jonathan Aro and David Rollins were called up. Johnson will presumably head to Triple-A Tacoma now where he began 2016, repossessing a 2.25 ERA and 0.75 WHIP through 16 innings.
