Green indicates that a pitcher is definitely going to throw that game.
More specifically, it means a starting pitcher (RHP, LHP, RHS, LHS) has a game status of "Starting" or "Starting Limited Innings" and a reliever (RHR, LHR) has a game status of "Pen Definitely Throwing".
The purpose of the color is to immediately let you know there is a pitcher in this game who is definitely going to throw.
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