Fighter got old "overnight"

[jas]

What does this actually mean?

And give examples of when it happened.

[4Corners]

It means they looked great the previous fight, but the next fight who ever they fought kicked their ass, so now they're all of a sudden old and done to discredit the fighter that beat them.

[sugarsmosley]

mosley looked like he aged 10 years between the margs and floyd fight

[major handz]

that entire topic alone is debatable though.

some days i have good days some days i have bad days ..some months are bad for me energy wise regardless how much i work out..some months are great..

some months i look shot ..some months the planets are in my favor..

but alot of fighters bounce back and plenty have before..

Ive never really seen a fighter get old over night ..many bounce back

some times psychological trauma eats you though hence hatton,hadmed,pavlik,jermain taylor,meldrick taylor,and many more

but fighters just like us have frequent ups and downs

[Larry the boss]

Basically what it says,compared to their last fight they got old overnight

[SeekDaGreat]

Margarito is the definition of getting old over night.

[jas]

Basically what it says,compared to their last fight they got old overnight

a slow progression up until the fight? where does the "overnight" thing come into play?

[mathed]

What does this actually mean?

Go watch the Adamek fight from Sat night, that fight is the paradigm for this saying.

[sdcluser]

What does this actually mean?

Forget the exact definition.

Check Juanma Lopez before and after the Salido fight.

[The Problem Child]

It refers to a fighter who had one last good performance left in him but age caught up with him soon after and it showed on his next fight.

Overnight is not used literally, it is used more as a replacement for the world suddenly.