How do you introduce yourself to captains & coaches?

[offici88]

First name to captains, first and last to coaches. Coaches usually find a way to connect with me before the game starts or know from their ADs who's working their games. (I would want to know.)

I appreciate players that call me sir as it shows me they understand we're not peers. That makes me more inclined to learn/know their first name to call them by it as appropriate.

When I ump baseball, I introduce myself to the catcher by first name as we'll have more of a relationship for 2 hours and I want him to feel comfortable talking to me.