Abstract: A cover housing for a tennis net support post includes a casing which defines an interior chamber and can, be positioned over the support post, and a cap which fits on top of the casing, the casing including upper and lower positioning means for contacting the support post therein to fix the casing in position relative to the support post and adjust its orientation, e.g. to vertical. The cap includes a slot through which a tennis net cable can pass into the interior chamber of the casing. An embodiment of the housing embodiment for covering a support post having a cable winch mounted thereon includes a vertical slot in its outer side to enable the tennis net cable to pass to the cable winch (remounted on its outer side) after having passed over the upper end of the support post therein. The positioning means can include a mounting element that extends into the side of the casing and a screw element that extends through the mounting element into the interior chamber of the casing.