Good analysis! There’s also the degree of difficulty factor of both sports…very similar! trying to hit a baseball coming at you at 100mph from only 60’ away is all but impossible except for the relatively few gifted among us. Returning a 130mph tennis serve is also very very difficult. Catching a high fly ball on the run is also all but impossible for most people. I say that high skilled tennis and baseball are the two most difficult sports to master.