Bummer allowed a hit and struck out one over a scoreless eighth inning in Thursday's 5-4 loss to Cleveland.
Bummer was activated from the injured list earlier in the day and resumed his role as the White Sox's eighth-inning bridge to closer Alex Colome. Unfortunately, two relievers before him conspired to give away Chicago's three-run lead in the seventh inning, and Bummer's appearance took on less significance.