Which fighters were had the best Heart, grit, determination and never gave in?

[talip bin osman]

Joe Calzaghe, Gatti, PBF, Vitali Klitschko

can u remember round 9 in his 1st fight with ward?

he was laid down by a left hook to the liver and still got up! not only got up but fought back big!

heart, grit, determination and never giving in... boxes all ticked...

[Barn]

Shame on you for forgeting marciano! Haha

That's scary, I remember thinking of a Marvin Hagler quote when he said,
" They said me and Marciano were the hardest trainers ever" I'm almost sure I put him in lol.
My mistake, Rocky had a massive heart equal to or bigger than his power.