Abstract: The specification discloses a reducer for a golf hole on a putting surface for practicing putting on a putting surface which forms a circular peripheral lip around the golf hole. The reducer comprises a cover and retaining means for positioning the cover over the golf hole. The cover has a U-shaped cutout has a width which is smaller than the golf hole and larger than the golf ball. The retaining means positions the cover over the golf hole to define a reduced diameter practice hole within the golf hole, the practice hole being defined by the U-shaped cutout and an exposed a front segment of the golf hole peripheral lip beneath the U-shaped cutout. The cover and U-shaped cutout are thus positioned to allow a golf ball to roll over the front segment of the golf hole peripheral lip into the practice hole without contacting the cover.