First Round 9.
Sentomaru
VS.
Donquixote Doflamingo
Atmos, one of WB's commander couldn't do shit against Dofla's ability, you believe that Sentomaru would be able to do so ? Jozu too couldn't do shitI believe that Sentomaru could cut Doflas (assumed) strings pretty easily. He may be huge, but he's not as idiotic as a certain other giant rushing forward. On top of that, Sentomaru has a pretty tough defense and his attacks don't need contact. Dofla on the other hand didn't seem to have a proper fight yet we could deduce him owning Sentomaru from. We do know his ability could stop Jozu, which is a great feat already. We also know Baby 5's attacks didn't harm him, though that might be little more than a mosquito. And lastly he fought Moriah - who was in a clearly weakend state.
Altogether it's not a clear winner, but I'd go for Sentomaru so far.
What ? I don't want to sound rude, but do you even read what you are saying ? Atmos negligible, him being one of the commanders of WB is negligible ? And you consider Sentomaru stronger because of what please ? His feats are limited to beatin pre timeskip Luffy after he was tired from fighting one Pacifista with the rest of his crew, that's some feat alright !Atmos is almost negligible, if it wasn't for his sword being useless... Jozu however an experienced, long serving commander who can withstand Shanks hakiburst is the bigger "problem". I don't know how or why Dofla could hold him back, but as I said, I think the axe is enough to counter that puppeteer move, next to Sentomarus ranged melee attacks and enormous ability to not only use, but to employ haki, that is.
According to himself, says it all.@Zehahaha: Atmos is indeed negligible to my theory. He's commander of the what? 13th division? Sure he's a big shot, but it pales in comparision to Jozu and thus, again, is negligible. Could just as well argue with Dofla controlling a Marine back then.
As for Sentomaru, you are underestimating him by far. He beat pre-timeskip Luffy and that's grantedly about the last thing we saw from him. But! Who says he couldn't beat Luffy now? His haki? Sentomaru has way more experience with it and -again- the toughest defense... according to himself xP
" I'm the STRONGEST MAN in the world, nobody can beat me ? Want a proof ? Oh no, it's real in my mind so yea "I think it would be a good match. Sentomaru has the best Haki defense. However, Jaws (Jozu, in the romanji, lol) had the best physical defense, being made of diamond, but he still got controlled by Doflamingo. On the other hand, Doflamingo and Crocodile seemed to fight pretty evenly, so who knows how strong Doflamingo is.
But in this fight, I expect Doflamingo to come out on top.