How to fix it
Simply put, Detroit Tigers relievers need to miss more bats.
This is obviously easier said than done, but the more outs the team gets via the punch out, the less of a chance that a bloop double falls, or that an inning extending, ground-ball single finds a hole.
The incumbent relievers may not fix the issue by themselves, but adding a veteran or two from the free agent mix would certainly help things.
The free agent market
Now, obviously swinging strike percentage isn’t the entire picture where bullpen pitchers—and pitchers in general—are concerned, but it is a prominent piece of the puzzle.
Signing a player like Gregerson, Romo, Barnette or Oh on a short-term contract would give new manager Ron Gardenhire a late-inning-caliber reliever arm to pair with Alex Wilson in building the bridge to Greene.
Signing a player like one of the aforementioned quartet would also give the Tigers some much-needed insurance should the team’s current closer switch uniforms via trade.
Add in a pitcher like Jimenez or Rondon starting to make good on their potential, and Detroit’s bullpen will be in much better shape moving forward.
Not just from an overall standpoint, but also from a missing bats standpoint.