About to start his fourth MLB season, Aaron Bummer has to be the White Sox best arm besides Colomé. In 2019, the 25-year-old posted a 2.13 ERA in 67.2 innings which is outstanding. He did earn one save so technically he does have experience closing games. Throwing a player into a high-intensity moment with everything on the line who is not used to that type of pressure is obviously foolish. So perhaps moving forward, Bummer is not the closer if the stars align.
Despite this, he is still doing a tremendous job of keeping the opposition at bay. Seventh and eighth inning appearances will be his sweet spot. Drafted in the 31st round by the Yankees in 2011, Bummer has certainly surpassed the expectations that were attached to his name. Now that the lefty has found success in the majors, it is just a matter of maintaining that same success.
The best part is how long the White Sox have control of Bummer. He is pre-arbitration eligible this year and arbitration-eligible next year, the team essentially has control of him until 2025. Hopefully, by then the Sox won a World Series or two. If Colomé struggles in 2020, it is likely Bummer will take over the closing role. But as of now, if the opposing team is trailing by the end of the seventh inning, it will be quite difficult beating the White Sox.