Abstract: A portable backstop has a vertically upstanding inverted first U-shaped frame including legs supported on a base and a second, smaller, U-shaped frame pivoted from an intermediate point of the legs of the inverted U-shaped frame. The frames support a bag-shaped mesh net for receiving a ball. When the backstop is unfolded for use, the second U-shaped frame extends outward and the net, attached around the upper perimeter of the frames, forms a pocket for receiving a ball. The second U-shaped frame folds upward against the first frame for transportation and storage. The backstop may be used indoors or outdoors.