I would guess that Mas Oyama was the toughest fighter in history. I strongly doubt that Bruce Lee could have stood up to him. Oyama was just so much bigger and stronger, and had even more fighting experience than Bruce Lee had. Further, Bruce Lee didn't have the judo background that Oyama had, being a high level black belt in the art. Oyama won a major tournament in karate, then toured America taking on and defeating all comers including top legitimate wrestlers. The only people I think would have had a chance against him might have been members of the legendary Gracie family of Brazil. Oyama fought bulls in hand to hand combat, and apparently had a record of 46-1 against them, judging by this book. Since we revere our sports heroes, it is definitely worthwhile to have a thorough biography of the greatest fighter who ever lived. This isn't it. Right subject, wrong author. What we have here is a lightweight biography and a pretty good overview of Oyama on a superficial level. I learned that the rumor that Oyama mashed his two big knuckles together to form one super knuckle is probably incorrect, since he seems to have regular knuckles and this rumor isn't mentioned in the book. I learned that the main thing that distinguishes his kyokushinkai from other karate styles is the toughness of it, notably the practice of allowing (demanding) full contact sparring with no protective equipment, though apparently no punches were allowed to the face, judging from printed tournament rules. I learned of the 100-fight challenge, having a karate master take on 100 consecutive opponents. Obviously the goal isn't to decisively beat them all, but rather to survive the ordeal, though in Oyama's case he did it on three consecutive days and most certainly went 300-0. This book gives you some basic facts about the greatest fighter who ever lived, but it isn't a great biography or anything close. It just fills you in a bit, and was written by someone who knows.