@Big_Boss
Ali Jr., but he was wounded from fighting Jack & Shibukawa, and he had already starched Doppo before.
Before that he did beat Dorian, but Dorian (technically) avenged that loss by beating him with his wrist-bomb-thingey.
And before that.... Amanai Yu I guess ? But that was Yujiro finishing him so idk if you can count that.
So yeah, it's been 20 years since Jobppo has won against someone in a clean 1v1.