Flex Player= A player who only fields and does not bat
On Deck= 2nd (next) to bat
In the hole= 3rd up to bat (after the person on deck)
HBP= Hit by pitch
BB= Base on balls
Pinch Runner= A Sub who will run for someone (most likely the pitcher or catcher) once they have reached a base.
SB -Stolen Base
SO (K) - Strike Out
WP - Wild pitch
RBI - Runs Batte In
HR - Homerun
SS - Short Stop