Overview

• Chicago placed the 24-year-old right-hander on the IL retroactive to Sept. 25, ruling him out against the Padres in the best-of-three that begins Tuesday at Wrigley Field.
• Left-hander Jordan Wicks was recalled in a corresponding move for the season’s final games and postseason coverage.
• Horton exited his Sept. 23 start with back/rib tightness; imaging showed areas of concern, and the club linked the issue to a recent illness with persistent coughing.
• Team president Jed Hoyer said Saturday’s throwing made clear Horton could not pitch without changing his mechanics, prompting the decision.
• With Horton sidelined, Matthew Boyd and Shōta Imanaga are lined up for Games 1 and 2 with Jameson Taillon or Colin Rea in play for Game 3, as recovery data on rib fractures suggests absences often extend beyond the minimum.