We claim the ornamental design for a wrist guard cover, as shown and described.
FIG. 1 is a perspective view of a wrist guard cover, showing our 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 hand in FIG. 1 depict environmental matter and form no part of the claimed design. A wrist guard cover for the right hand is illustrated in the drawings, it being understood that a wrist guard cover for the left hand is a mirror image thereof.