What are some things to say to a pitcher to calm him down in the middle of the game?

To calm a pitcher during a game, you can say, "Take a deep breath, focus on your mechanics, and trust your stuff." Remind him to slow down and visualize his last successful pitch. Encourage him by saying, "You've got this; just one pitch at a time." Lastly, express confidence in his abilities with phrases like, "We're behind you, just do what you do best."