FIG. 1 is a left side elevational view of baseball baseball hat, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken line showing of the human form in FIGS. 1, 2, 3, and 4 is for illustrative purposes only and forms no part of the claimed design.