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Are we talking about fighting ability in general, or purely from Infinity War?
Because in general, it'd be:
SS
Thanos
S
Hulk, Thor, Dr. Strange, Ebony Maw, Black Dwarf
A
Iron Man, Vision, Scarlet Witch
B
Captain America, Spider-Man, Black Panther, Winter Soldier, Gamora, Groot, Proxima Midnight, Corvus Claive
C
Star Lord, Rocket, Drax, Nebula, War Machine, Falcon, Black Widow, Shuri