Papa John’s has signed a multiyear deal to be MLB’s official pizza, bringing “Papa Slams” to the game. Papa John’s will activate an integrated marketing and experiential campaign across MLB’s media platforms, signature events and the Play Ball initiative. It also is set to contribute for a lot of pizza deals. For every Papa Slam hit from Opening Day through the season, fans can receive 40 percent off any pizza at regular menu price online the following day.