User blog comment:Nashster2/sanji's rivals/@comment-3181121-20110317084355

What I think could be a real cool fight because they have similar styles would be Sanji vs. Marco

And as for rivals, I guess in the Blackbeard Pirates Jesus Burgess and in the Red Haired Pirates Lucky Roo. He doesn't really have rivals though, partially due to the fact that he isn't first and foremost a fighter like Luffy and Zoro, but he is a cook.

Maybe you could count Zeff as a rival for him too.