Abstract: A portable sport boundary fence is provided for use in a miniaturized baseball game wherein a hollow, perforated plastic ball is used with a hollow plastic bat wherein the fence comprises a plurality of hollow, tubular posts, each of which is slidably and removably engaged by a post anchor, wherein each of the posts is sufficiently thin at its base so that, when impacted by a player, the post either bends or breaks to avoid injury to the player, and wherein perforated netting is provided to extend between the posts and connectors are used to attach the perforated netting to each of the posts.