Mas Oyama, the founder of the rugged Kyokushin Karate. The full excerpt may be found here. Oyama was also friends with Kenichi Sawai, who founded Taikiken based on his study of Yiquan during the Japanese occupation of China during WWII.
It is a little known fact that the legendary Founder of Kyokushin Karate, Sosai (Grandmaster) Oyama admitted to only one single defeat in his entire life as a Karateka.
The man is whom the martial arts world call the "God Hand" or the "God of Karate".
He is a man who easily sliced through bottle-necks, broke rocks with his knife hand, killled bulls with a single blow, defeated hundereds of martial art masters & professional fighters, boxers, wrestlers all over Japan & the whole world.
Yet in his biography this invincible Karateka revealed that he could not beat one frail old man - an old man who practices "Taijiquan", the art of the Grand Ultimates.