support post 230 such that the anterior face does not rock against a differently shaped upright support post for example should a round upright support post support the basketball hoop and backboard assemblage a rounded or concave like anterior face is contemplated further it is contemplated that a flat anterior face with forwardly extending upright support post engaging protuberances may snugly fit the anterior face portion of the mounting block to the upright support post so as to provide structure to prevent a rocking effect when the anterior face is not similarly shaped as compared to the shape of the upright support post backstop net assembly 100 preferably further comprises means for mounting mounting block 20 to upright support post 230 it is here recognized that there are many ways to attach or mount the described mounting block to a support means or upright support post an exhaustive list of which is excluded from this writing it is understood that it is within the ordinary skill of a person skilled in the art to devise obviously equivalent means for attaching or mounting the described mounting block to a support means or upright support post and an exhaustive list would be unduly lengthy excellent results have been achieved in this last regard however where the mounting means are preferably further defined by comprising a superior hose clamp 28 and an inferior hose clamp 29 as illustrated in fig nos 6 and 11 superior hose clamp 28 and inferior hose clamp are preferably constructed of stainless steel and are sized and shaped to fit circular cross.