What would happen if you tried to hit a baseball pitched at 90% the speed of light?
Randall Munroe attempts to find out.
Everything within roughly a mile of the park is leveled, and a firestorm engulfs the surrounding city. The baseball diamond is now a sizable crater, centered a few hundred feet behind the former location of the backstop.
Eh, still better than watching Miguel Olivo or Carlos Peguero try to hit anything.