Baseball event (4)
(Other definitions for game that I've seen before include "partridge, pheasant ...?" , "Eg, football match" , "Hobbling" , "Animals hunted for food" , "What might get hung" .)
(Other definitions for opener that I've seen before include "initial goal" , "No.1 or No.2 bat" , "batsman facing the first ball?" , "Initial event" , "Leading cricketer" .)