Abstract: A modular, temporary fencing system for sports arenas comprises a plurality of spike-footed poles and a plurality of mesh fencing panels. The poles each have four longitudinal “key-hole” slots, and opposite side ends of the mesh fencing panels are configured to fit in the slots. To delineate a sports playing field or arena, the side ends of the fencing panels are inserted into the key-hole slots, and the poles are partially inserted into the ground, with the fencing panels supported there between, according to the desired dimensions and shape of the playing field or arena. Further, the poles are composed of a polymer chosen so that the poles are rigid enough to support the fencing panels and to delineate the playing area, yet flexible enough so that when a player falls against the fence, the fence can bend substantially to the ground without injuring the player or breaking.