Since the other two threads on this topic sunk, I'll post a new one.
Zoro Vs. Blackbeard (It will probably end in a draw if it happens, since Blackbeard is stronger and its basically a OP law that Zoro can't lose any battles after Mihawk.)
Zoro Vs. Mihawk (2nd Round) (This will probably happen, except with Zoro winning this time. But it would also be cool as a twist if he loses again.)
Sanji Vs. Jesus Burgess (Kick-only guy vs. big wrestler…I can see it now...The future! :D)
Chopper Vs. Vegapunk (I'm weird. -_- But why do I feel like this could happen? o_o)
Chopper Vs. Doflamingo (I liked this idea from the other thread. Chopper would probably fail epically at first, but then starts owning that annoying Schibukai with Monster Point! :D)
Blackbeard Vs. Bellamy (Dreamer vs non dreamer. I think this would barely be a fight though…Lol.)
Sanji Vs. Miss Doublefinger (FAIL!!!!!!!!!!!!!!)
Sanji Vs. Every Female Baroque Works Member That Ever Lived (This including Mr. 2 and 3...OK sorry!)
That's all I have now.