All of Batman's best enemies in one on one fights.
Two-Face vs The Riddler
Man-Bat vs Killer Moth
Catwoman vs Harley Quinn
Mr. Freeze vs Maxie Zeus
The Joker vs The Penguin
Killer Croc vs Firefly
Bane vs Black Mask
Clayface vs Deadshot
Ra al Ghul vs Scarecrow
Two-Face vs The Riddler -Generally Two-Face, though on rare occasion Riddler has been shown with good enough equipment to get a solid win.
Man-Bat vs Killer Moth -Man-Bat, KM lacks the strength/firepower
Catwoman vs Harley Quinn -Catoman
Mr. Freeze vs Maxie Zeus -Freeze
The Joker vs The Penguin -Joker, as Penguin smartly surrenders.
Killer Croc vs Firefly -Hm, between range and flight, Firefly, though if Croc got his hands on FF it'd obviously go the other way
Bane vs Black Mask -Bane breaks him
Clayface vs Deadshot -Clayface, bad matchup for DS
Ra al Ghul vs Scarecrow -Ra's.
__________________ Quotes from Hia8:
"I claimed that the science is sometimes faulty."
"You don't understand. This is fiction. That means none of this stuff really happened."
"There is no writer to purposely ignore a character's natural ability just because it suits the story."
"in some cases because the writer knows that Character A will dominate Character B easily and refuses to allow this to happen for the sake of the story."