The ornamental design for a baseballcap with a hole on the top, as shown and described.
FIG. 1 is a side perspective view of a baseball cap with a hole in the top as shown in a position of use;
FIG. 2 is a front, top perspective view of the baseball cap with a hole in the top;
FIG. 3 is a front view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a rear view thereof; and,
FIG. 6 is a bottom plan view thereof.
The partial human figure outlined by broken lines assist to illustrate the claimed design in a position of use and forms no part of the claimed design.