Jennings (2-1) allowed a walk-off single to pinch hitter Guillermo Heredia in Thursday's 5-4 loss to the Mariners.

Jennings has been part of one of the best bullpens in MLB this season, but his season has taken a turn since the calendar flipped to May. The left-hander has allowed eight runs (seven earned) on nine hits and four walks over 3.2 innings this month. It speaks to the injuries the White Sox are dealing with among their relief corps that he was asked to handle such a high-leverage spot, as Zach Putnam (elbow), Jake Petricka (back) or Nate Jones (elbow) would normally enter the ninth inning of a tie game, but manager Rick Renteria was forced to use Jennings on Thursday.

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