I claim the ornamental design for a sporting ball holder with an air pump, as shown and described.
FIG. 1 is a perspective view of a sporting ball holder with an air pump, showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left-side elevational view thereof;
FIG. 5 is a right-side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines showing a sporting ball in FIG. 1 depict environmental matter and form no part of the claimed design. All other broken lines depict portions of the sporting ball holder with an air pump that form no part of the claimed design.