User blog comment:Dandalore/One's Struggle/@comment-4311127-20111231000429

Lucci since he's the only one that came close to beating Luffy with strength and skill all the others Luffy found a weakness of sorts to beat them with. With Lucci, Luffy had to use all his strength and skill to beat him. Any other time I would say Aokiji or Magellan since Luffy couldn't beat either of them, and since both of them almost killed Luffy. Between these two Magellan would have to be the one to go with since Luffy had the help of most of the Impel Down inmates and still couldn't beat him. With Aokiji, Luffy couldn't beat him, but he was by himself.