On Friday, for the first time, the Grapefruit League will hold a Media Day in Fort Myers, Fla., and MLB.com will be on the scene. Commissioner Rob Manfred will take the podium at 4:30 p.m. ET, and among the topics likely to be discussed are the “takeout slide” rule at second base, protective netting around home plate and the future of the designated hitter in the National League.