Is there a fighter in history who could do this?

I've been reading a bit lately about boxers with granite chins. I came across George Chuvalo and what I read about him was unbelievable. So unbelievable in fact that I had to watch his fight against Foreman on YouTube before I could believe it. This man fought 93 pro fights including Muhammed Ali (x2), Joe Frazier (x1), Floyd Patterson (x1) and even Geroge Foreman (x1). He has NEVER kissed the canvas and even Muhammed Ali said Chuvalo is the toughest man he'd ever faced. Is there a fighter in history who could knock down George Chuvalo?