In MLB baseball, why do infielders after catching the ball show their gloves to the umpire as if to sell a close play ?

2021-03-20T03:40:33Z

Its obvious to all that the guy caught the ball.

Slickterp2021-03-29T23:29:59Z

To show they caught the ball.

conley392021-03-17T00:01:37Z

To prove they caught the ball.