Los Angeles Dodgers manager Dave Roberts confirmed that Clayton Kershaw will not be part of the team’s National League Wild Card Series roster. The announcement, made on Sunday, signals a major development in the Dodgers’ postseason approach and raises questions about their pitching lineup.

Cade Horton, the Chicago Cubs’ premier starter, has been sidelined by a rib fracture and placed on the 15-day injured list. This setback keeps him out of the wild-card series and hands the Cubs a critical challenge right when every pitch counts.

Late-season baseball is all about the math. The San Francisco Giants are breathing down the necks of the New York Mets, whose hold on a playoff spot could slip away if they can’t hold their ground. Here’s a look at the latest magic numbers and potential matchups.