At what point is a fighters chin suspect?

Guys like Gamboa or Marquez who even though they don't get hurt or knocked out hit the canvas regularly. Someone like Williams who gets knocked out in one fight doesn't have a suspect chin unless it starts happening often.

If Paulie Maliginaggi knocks you down or out you know your chin is suspect. Thank you took the words right out of my mouth or if you got knocked out by Sergio mora

When they get dropped three times in one round by a featherfisted Japanese opponent. Especially when they are 35 y/o with just 7 KO's.

When they get dropped three times in one round by a featherfisted Japanese opponent. So Kirkland's chin is now suspect. If Paulie Maliginaggi knocks you down or out you know your chin is suspect.

How many times has Berto been down in his career? He was down when he fought Cosme Rivera. I can't think of any other off the top, but he hasn't exactly been fighting world class punchers. He was also stunned a few times when he fought Collazo and that guy can't even punch that hard.

When they get dropped three times in one round by a featherfisted Japanese opponent.

I always see posters here calling fighters chins' suspect. So that begs the question, at what point is a fighters chin suspect? Is a fighters chin suspect after multiple knockdowns, a knockout, or multiple knockouts? Does a fighter like Paul Willams now possess a suspect/glass chin? Most fighters suffer some knockdown/s in their careers. When most of his losses end in KO or stoppage, also in extreme cases, when he's staggered or stiffened by a reasonable but not exceptional punch. Like Khan for instance. Not his fault, just the way he is.

I've seen a lot of people claim that David Haye's chin is suspect, is this true?

His chin sucks. But he has great recovery rate and makes adjustments after getting tagged cleanly. A guy like Berto also has a suspect chin. How many times has Berto been down in his career?

Fair enough, so is it safe to say that JMM has a suspect chin? His chin sucks. But he has great recovery rate and makes adjustments after getting tagged cleanly. A guy like Berto also has a suspect chin.

poor response to getting hit............ rubbery legs, queer street, stunned, or staggered, all off of shots that otherwise wouldn't have any of those affects with a guy with a decent beard.......... i wouldnt count flash knockdowns, or even going down from a good shot, but more so how one responds after getting hit with a not so decent shot........ but all the above equals suspect chin.......

After a knockout. Like JMM who is real chinny but he's never been knocked out.

When they regularly get hurt with single shots. Fight after fight, opponent after opponent. Fair enough, so is it safe to say that JMM has a suspect chin?

When they regularly get hurt with single shots. Fight after fight, opponent after opponent.