net directly behind homeplate
a patch of green grass
a baseball field net 
white lines on a baseball field 
People are playing a baseball game
A batter is hitting the ball
An umpire is watching the game
An umpire is behind the catcher
A man is swinging a bat
A game is being played in daytime
A person has struck the baseball
A baseball is in the air
a batter swings his bat at the ball as the catcher and umpire are behind him, and man on the field waits for the pitch