Mohammad Alai

Mohammad Alai is a former strongest boxer on the world. He had the world strongest and fastest punches. Due to his age and having an advanced disease, he's weaker than he used to be. But despite of that, he can still have the speed and the power just like in his prime time, but only for one minute. He could even punch Baki Hanma before he could react.

(Source: Baki Wiki)