You vote for the one who you like more, not who's the strongest in a fight and have fun:
Dove (Dawn Granger) vs. Hawk (Holly Granger)
Metamorpho (Rex Mason) vs. Maxwell Lord
Big Barda vs. Prometheus II
Mary Marvel vs. Manga Khan
The Tattooed Man (Mark Richards) vs. Green Lantern (Tomar-Re)
Katana vs. Magpie
Atom (Ryan Choi) vs. Dwarfstar
Jade (Jennie-Lynn Hayden) vs. Green Lantern (Soranik Natu)
Despero vs. Gypsy
Phantom Lady (Jennifer Knight) vs. Green Lantern (Salaak)
Arsenal (Roy Harper) vs. Merlyn
Vox (Mal Duncan) vs. Aztek
Frankenstein vs. Metron
Cyborg (Victor Stone) vs. Dr. Light (Arthur Light)
Midnighter vs. Folded Man
Brainiac 5 vs. Sgt. Rock
Bane vs. The Rag Doll (Peter Merkel Jr.)
Guardian (Jim Harper) vs. S.T.R.I.P.E.
Cosmic Boy vs. Element Lad
Deathstroke vs. Freddy Freeman
Mongul I vs. Steel (John Irons)
Tempest (Garth) vs. Red Panzer II
Saturn Girl vs. Dream Girl
Blue Lantern (Saint Walker) vs. Chronos (Walker Gabriel)
Superboy (Kon-El) vs. Knockout
Brainiac vs. Ferro Lad
Geo-Force vs. Judomaster (Sonia Sato)
Vandal Savage vs. Damage
Bizarro vs. Metallo
Robin (Damian Wayne) vs. Professor Pyg
Green Lantern (Mogo) vs. Red Lantern (Atrocitus)
Batman (Terry McGinnis) vs. Doomsday
Psimon vs. Godiva (Dorcas Leigh)
Wonder Girl (Cassandra Sandsmark) vs. Anti-Monitor
Captain Boomerang (George Harkness) vs. The Pied Piper
Klarion the Witch Boy vs. Jakeem Thunder
Orion vs. Kalibak
Clayface (Basil Karlo) vs. The Key II
Jinx vs. Vibe
Elongated Man vs. Copperhead
Shimmer vs. Amethyst
Black Lightning (Jefferson Pierce) vs. Gangbuster (Jose Delgado)
Obsidian vs. Citizen Steel
Gizmo vs. Hourman (Matthew Tyler)
The Scarecrow vs. Lobo
The Brain vs. Dolphin
Sandman (Morpheus) vs. King Chimera
Monsieur Mallah vs. Blue Beetle (Jaime Reyes)
Professor Zoom vs. Johnny Quick (Johnny Chambers)
Zan vs. Blue Devil
Red Lantern (Guy Gardner) vs. Simon Stagg
Jayna vs. Batwing (Luke Fox)
Mon-El vs. Arrowette (Cissie King-Jones)
Mr. Mxyzptlk vs. Bushido
Static vs. Bombshell
Lightning Lad vs. Replicant
Jesse Quick vs. Cyclone
The Ultra-Humanite vs. Prysm
Batwoman (Kate Kane) vs. Congorilla
Tigress (Artemis Crock) vs. Risk
Mammoth vs. Terra (Tara Markov)
Rocket Red (Dmitri Pushkin) vs. Emerald Empress
Red Hood (Jason Todd) vs. Indigo (Brainiac 8)
Etrigan the Demon vs. The Ray (Ray Terrill)