Awesome fights in the anime? Kizaru and Sentomaru vs. Straw Hats were made better in the anime imo. Episode 404-405.
Also pretty much the whole Marineford arc was cool in the anime too, but Whitebeard vs. Akainu was made less violent.
So are you just looking for good fights throughout the whole anime?
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Easiest bracket ever, yet we all failed!
Well except SuperNiceDog, of course!