The ornamental design for a strap for retainingball in baseball glove, as shown and described.
FIG. 1 is a front perspective view of a strap for retaining ball in
baseball glove showing my new design;
FIG. 2 is a rear elevational view thereof, the broken lines illustrating a
baseball glove area for illustrative purposes and form no part of the
claimed design;
FIG. 3 is a left side elevational view, the right side being a mirror image
thereof;