A shelf divider apparatus and a system thereof are disclosed herein. The shelf divider apparatus is configured to attached to a wire shelf including a front top rail, a front bottom rail, a plurality of balls separating the front top and bottom rails, and a plurality of support wires supported by the front bottom rail. The shelf divider includes a first end, a second end, and a first clip connected to and extending below and away from the first end. The first clip includes a plurality of receivers defined along a lower portion of the first clip and extending perpendicularly relative to a divider length. Straight slots are defined between adjacent receivers. Each straight slot includes an enlarged opening spaced apart from a straight slot entrance for accommodating a portion of one ball of the plurality of balls so that the plurality of receivers may engage the front bottom wire.