Knapp will start at catcher and serve as the Phillies' leadoff man Sunday against the Pirates, Todd Zolecki of MLB.com reports.
Incredibly, Knapp is the first catcher to serve as a leadoff hitter for the Phillies in the live-ball era, per the Elias Sports Bureau. It's likely just a temporary assignment for Knapp, as the Phillies could get primary table setter Cesar Hernandez (foot) back as soon as Monday's doubleheader against the Mets.