April 17, 2021

Aaron Bummer’s Sinker Is No Disappointment (FanGraphs)


This season, the AL Central could feature three above-.500 teams for the first time since 2015. The Twins and Indians should remain at the top of the division, but after an active offseason, the White Sox could very well join them in a tight race. It reminds me a bit of the NL East in recent years: a lot of good teams, but none without a glaring hole somewhere.

The White Sox are hardly immune. Their rotation doesn’t project to be great, and there are still a few question marks in the lineup, like whether Yoán Moncada will regress, or Nomar Mazara will progress, and how Luis Robert will hit.

But even with those options, I would argue that Chicago’s most prominent weakness is their bullpen. By projected WAR, the White Sox relief unit ranks 26th in the majors, their worst individual ranking among any of the 12 positions we currently have listed on our Depth Chart pages. Most of their expected value comes in the form of Aaron Bummer, who flew far under the radar last season despite being among the best at one extremely important skill: inducing groundballs.

Highest Groundball Rates

Qualified Relievers

In 2019, hitting against this lefty was quite the bummer, if…

Read “Aaron Bummer’s Sinker Is No Disappointment” at FanGraphs