Flaherty will start Sunday in Game 1 of the NLCS against the Mets, Fabian Ardaya of The Athletic reports.
Flaherty was roughed up during his first outing of the postseason, surrendering four earned runs over 5.1 innings in a loss to San Diego, but he figures to have a good chance to bounce back Sunday after turning in a 3.17 ERA during the regular season.