User blog comment:Magnumheart/Just for fun. Strawhat Pirates vs Blackbeard Pirates/@comment-69.87.160.2-20120505140732

Here's what I think:

Monkey D. Luffy vs. Marshall D. Teach (of course because their captains, plus D. carriers, personal grudge etc.)

Roronoa Zoro vs. Shiliew

Usopp vs. Van Augur (of course)

Sanji vs. Jesus Burgess (brute strength, both have sort of served as helmsmen, major fighters of their respective crews)

Nico Robin vs. Caterina Devon ( two notorious women, both are major enemies of the World Government)

Franky vs. Vasco Shot (Vasco Shot's skills unknown, but thinking cola drinker vs. sake drinker)

Tony Tony Chopper vs. San Juan Wolf ( Monster vs. Monster Point)

Brook vs. Lafitte (Magnumheart's idea) or Avalo Pizarro (Corrupt King vs. Soul King)

and i guess Nami vs. Doc Q and Stronger