As much as I enjoyed that fight hanayama vs speck it’s not as good as Jack vs Baki in the maximum tourney
Sword of the Stranger's fights still look stunning and realistic (except for that sonic spin-dash during the final fight). Gurren Lagann wins hands down for fist pumping hype action. Then maybe Mob Psycho's recent season two fights for they're emotional weight?
Meruem vs Chairman Netero
Arthur vs Lancer
Kiritsugu vs kirei
It's not animated yet, it's airing next January. But it's going to be the most amazing thing to ever happen in anime history!
Don't miss the movie: https://myanimelist.net/anime/36862/Made_in_Abyss_Movie_3__Fukaki_Tamashii_no_Reimei
Rock Lee vs Gaara was the best fight in Naruto imo
AlsoTaiga vs Sumire inspired me to pick up a bokken
Madara vs the world.
Swordfights from Sword of the stranger
I personally liked
All Might vs Nomu (Hero Academia) and Nagisa vs Karma (Assassination Classroom)