You vote for the one who you like more, not who's the strongest in a fight and have fun:
Hawk (Hank Hall) vs. Dove (Don Hall)
Blockbuster I vs. Atom (Ryan Choi)
Mary Marvel vs. Zachary Zatara
Lighting Lad vs. Jericho
Hourman (Matthew Tyler) vs. Professor Zoom
Josiah Power vs. Lex Luthor
Lighting Lass vs. Rose Wilson
Kalibak vs. Firestorm (Raymond & Rusch)
Skyrocket vs. Brainiac
Phantom Girl vs. Mirage (Miriam Dorado)
Chameleon Boy vs. Traci 13
Congorilla vs. Detective Chimp
Karate Kid (Val Armorr) vs. Lady Shiva
Agent Orange (Larfleeze) vs. Gorilla Grodd
Speedy (Mia Dearden) vs. Emiko Queen
Dawnstar vs. Azrael (Jean-Paul Valley)
Krona vs. Vox (Mal Duncan)
Batwoman (Kate Kane) vs. Redwing
Green Lantern (Arisia Rrab) vs. Emerald Empress
Superboy-Prime vs. Wonder Girl (Cassandra Sandsmark)
Plastic Man vs. Elasti-Girl
Amethyst vs. Jinx
Vibe vs. Terra (Tara Markov)
Bronze Tiger vs. Cheshire
Duplicate Girl vs. O.M.A.C. (Buddy Blank)
Parasite (Rudy Jones) vs. Caitlin Fairchild
Steel (John Irons) vs. Gizmo
Negative Man vs. Lady Blackhawk
Ambush Bug vs. Bumblebee
Dr. Light (Kimiyo Hoshi) vs. Risk
Mento vs. Psimon
Roxy Rocket vs. Black Lightning
The Penguin vs. Green Lantern (Ch'p)
Shade (Richard Swift) vs. Killowat
Queen Bee (Zazzalla) vs. Argent
Vandal Savage vs. Mammoth
The Psycho-Pirate (Roger Hayden) vs. Kole
Rip Hunter vs. Timber Wolf
Orion vs. Shimmer
Solstice vs. Heat Wave
Major Force vs. Big Barda
Red Tornado (John Smith) vs. Lagoon Boy
Freddy Freeman vs. Mr. Mind
Tigress (Artemis Crock) vs. Robin (Damian Wayne)
Ra's Al Ghul vs. Green Lantern (Simon Baz)
Bombshell vs. Dr. Polaris (Neal Emerson)
Max Mercury vs. Ares
Tempest (Garth) vs. Bouncing Boy
Manchester Black vs. Blue Devil
Witchfire vs. Poison Ivy
Robotman (Cliff Steele) vs. Prestor Jon
Copperhead vs. Red Hood (Jason Todd)
Superboy (Kon-El) vs. Blackout
Striker Z vs. Black Adam
Clayface (Basil Karlo) vs. Lilith Clay
Sapphire vs. Black Manta
Cheetah (Barbara Minerva) vs. Pantha
Bork vs. Harley Quinn
Alanna Strange vs. Blackfire
Manhunter (Kirk DePaul) vs. General Zod
Jesse Quick vs. Magenta
The Joker's Daughter vs. Raven
Aqualad (Kaldur'ahm) vs. Bunker
Batman (Terry McGinnis) vs. Cassandra Cain