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I would probably give him (Tyson) about a 6-7 for stamina, simply because his longevity wasn't given too many opportunities to develop itself. Blasting people out early shows an incredible workrate, regardless of punch output; although many people on this website will tell you that, because of the punch numbers, he wasn't working hard. That's a load of BS seeing as how he demolished most opponents with fewer punches than those who threw two or three times as many. He put incredible amounts of effort into his workrate, causing the smart opponents to hug, hold, and run in the mid-to-late rounds with the hopes of tiring him out. Since Tyson didn't get too many opportunities to overcome this inevitibility, I will say that he probably slowed later on.
There are a few examples, however, like against Ruddock, where Tyson displayed good stamina.
Some more charts:
Muhammad Ali
speed=10 I think reflexes and fluidity were the big contributers here.
power=6
skill=8 Less orthodox than say, Holmes, but great improvisational skills.
defense=7 While his defense was flawed tactically, he was difficult to hit.
chin=9 Had one of the best ever in his extended career.
heart=8 Tough one; he did want to quit a few times, but always had it when it counted.
stamina=8
Joe Louis
speed=7 Quick, accurate punches, but slow footspeed.
power=8 Power to stun, enough KO when it mattered.
skill=10 Perhaps the most developed boxing mind ever.
defense=8.5 That low left hand keeps this below 9.
chin=7 Got rocked a few times, but solid (vs. Marciano).
heart=9 After 20+ title defenses and he still takes on all comers; most people wouldn't agree with this, but I think he deserves it.
stamina=8
Larry Holmes
speed=9
power=7 Had a zippier jab than Ali.
skill=9
defense=8
chin=8
heart=8
stamina=9
Rocky Marciano
speed=6
power=9.5 Pound for pound it's a 10.
skill=7 Trained harder than anyone, but wasn't too sharp.
defense=7 Got hit a lot.
chin=9 Never got KO'd.
heart=9 Always came back.
stamina=10 Could punch until the cows came home.
George Foreman
speed=7
power=10 Can we put 11?
skill=7.5 Displayed great skill earlier in career.
defense=7 Relied more on offense.
chin=7.5 Took some hefty poundings without scarring.
heart=7 Gave up in first career; this changed later on.
stamina=6.5 Punched himself out pretty early.
Joe Frazier
speed=7
power=9 Most dramatic left hook ever.
skill=9 Very hard worker.
defense=8 Crab defense was tough, but he was half-blind.
chin=9 Only KO'd by Foreman...that says a lot.
heart=10 Again, incredible worker, never gave up.
stamina=10 Fight Night 3 is way off here.
Mike Tyson
speed=9 His hand speed and footspeed have been clocked faster than Ali's. People will flame you if you dare post that this guy ran towards his opponents faster than Ali ran away from them, or that his hands reached their targets quicker, so I will give him a 9.
power=10 Few people had as many impressive shots.
skill=8 Never reached full potential.
defense=9 One of the hardest to hit.
chin=9 20" neck could absorb lots of punishment.
heart=6 He had heart until he won the belts.
stamina=7 Again, never reached full potential.
Evander Holyfield
speed=7
power=7
skill=9 Excellent counterpuncher.
defense=8
chin=8 Could take a suzie or two.
heart=10 He personifies heart.
stamina=9 Pretty tough, even later on in the fight.
This would make for a fun Collectible Card Game, and it would be educational for today's society who doesn't care about boxing anymore. I would even volunteer aiding in the design, research & development, and production of such a game/collectible hobby. This is fun.
There are a few examples, however, like against Ruddock, where Tyson displayed good stamina.
Some more charts:
Muhammad Ali
speed=10 I think reflexes and fluidity were the big contributers here.
power=6
skill=8 Less orthodox than say, Holmes, but great improvisational skills.
defense=7 While his defense was flawed tactically, he was difficult to hit.
chin=9 Had one of the best ever in his extended career.
heart=8 Tough one; he did want to quit a few times, but always had it when it counted.
stamina=8
Joe Louis
speed=7 Quick, accurate punches, but slow footspeed.
power=8 Power to stun, enough KO when it mattered.
skill=10 Perhaps the most developed boxing mind ever.
defense=8.5 That low left hand keeps this below 9.
chin=7 Got rocked a few times, but solid (vs. Marciano).
heart=9 After 20+ title defenses and he still takes on all comers; most people wouldn't agree with this, but I think he deserves it.
stamina=8
Larry Holmes
speed=9
power=7 Had a zippier jab than Ali.
skill=9
defense=8
chin=8
heart=8
stamina=9
Rocky Marciano
speed=6
power=9.5 Pound for pound it's a 10.
skill=7 Trained harder than anyone, but wasn't too sharp.
defense=7 Got hit a lot.
chin=9 Never got KO'd.
heart=9 Always came back.
stamina=10 Could punch until the cows came home.
George Foreman
speed=7
power=10 Can we put 11?
skill=7.5 Displayed great skill earlier in career.
defense=7 Relied more on offense.
chin=7.5 Took some hefty poundings without scarring.
heart=7 Gave up in first career; this changed later on.
stamina=6.5 Punched himself out pretty early.
Joe Frazier
speed=7
power=9 Most dramatic left hook ever.
skill=9 Very hard worker.
defense=8 Crab defense was tough, but he was half-blind.
chin=9 Only KO'd by Foreman...that says a lot.
heart=10 Again, incredible worker, never gave up.
stamina=10 Fight Night 3 is way off here.
Mike Tyson
speed=9 His hand speed and footspeed have been clocked faster than Ali's. People will flame you if you dare post that this guy ran towards his opponents faster than Ali ran away from them, or that his hands reached their targets quicker, so I will give him a 9.
power=10 Few people had as many impressive shots.
skill=8 Never reached full potential.
defense=9 One of the hardest to hit.
chin=9 20" neck could absorb lots of punishment.
heart=6 He had heart until he won the belts.
stamina=7 Again, never reached full potential.
Evander Holyfield
speed=7
power=7
skill=9 Excellent counterpuncher.
defense=8
chin=8 Could take a suzie or two.
heart=10 He personifies heart.
stamina=9 Pretty tough, even later on in the fight.
This would make for a fun Collectible Card Game, and it would be educational for today's society who doesn't care about boxing anymore. I would even volunteer aiding in the design, research & development, and production of such a game/collectible hobby. This is fun.
and whats your point 
like study marciano fights.
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