What does it mean by "It's all academic"?

You'll often hear sports commentators use this at the closing moments of a sports competition or game.

Could you give a couple of examples?

Thanks again.
ACADEMIC 3. theoretical or hypothetical; not practical, realistic, or directly useful: an academic question; an academic discussion of a matter already decided.
That doesn't really explain what I'm asking, though.
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What are you asking? I thought you wanted the meaning of the phase. 'Academic' is as I have quoted it. I presume that you already know what 'it's all' means.
I was asking what do sportscasters mean when they say "It's all academic" when referring to the end of a sporting event, game, etc.

Do they mean that "it's all over" -- nothing that the opposing team/athlete does will achieve a victory?
It's a done deal, over and done with -- it's etched in stone: nothing will now change the outcome; the outcome/end result of the contest has already been determined/decided.

Example: With 3 seconds left in the game, the opposing team was up by 25 points. It was all academic. (=The game was over and we knew who the victor was going to be.) Correct?

When Mike Tyson landed the uppercut, it was all academic from that point forward. Good?

This is the gist of what I think it means -- just need confirmation from an expert.

Thanks, Mr. Micawber
It depends on the situation, but your examples are valid instances, yes.
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But are they correct?
...your examples are valid instances, yes.