There can be plenty of similarities between players of both, three of them as mentioned below:
First of all, a player’s physical involvement is to be considered. Unlike many other games such as tennis and badminton, both football and baseball require strong legs and stamina at the same time.
You indeed need a good set of nifty legs for badminton, but you probably won’t have to run around the field tens of times like in these two. The next similarity is the player’s state of mind. Apart from being focused, both games require one to instantly respond in the respective ways to the ball being thrown differently on the ground or in the air.
Compared to other games that probably require you to just move your hands, football and baseball require legs, hands (for baseball only), and heads in preparation for any uncalled throw. Last but not least, both games also require extreme sprint, indisputably. There are plenty of other games alike, but football and baseball would arguably require you to sprint well and fast; more than anything.