The ornamental design for a sports ring, as shown and described.
FIG. 1 is a side perspective view of a sports ring showing my new design;
FIG. 2 is a top view thereof, the bottom view being a mirror image thereof;
FIG. 3 is a front view thereof, the rear view being a mirror image thereof; and,
FIG. 4 is a left side view thereof, the right side view being a mirror image thereof.
The structural elements in FIGS. 1 and 2 depicted by broken lines have been shown for the purposes of illustrating portions of the sports ring that form no part of the claimed design.