You vote for the one who you like more, not who's the strongest one in a fight and have fun:
Shatterstar vs. Tiger Shark
M.O.D.O.K. vs. Silk
Howard the Duck vs. Skullbuster I
Baron Zemo (Helmut) vs. Night Trasher (Dwayne Taylor)
Goliath (Bill Foster) vs. The Shadow King
Attuma vs. Stingray
Sage vs. Blackout (Marcus Daniels)
Mystique vs. Karolina Dean
Pete Wisdom vs. Scorcher
Shang-Chi vs. Moses Magnum
Spider-Woman (Gwen Stacy) vs. The Walrus
Hellcat vs. The White Rabbit
The Red Ghost vs. Skin
Caliban vs. Quicksand
The Shocker (Herman Schultz) vs. Rusty Collins
The Air-Walker (Gabriel Lan) vs. Feral
Sebastian Shaw vs. Pip the Troll
Guardian (James Hudson, Jr.) vs. Firelord
MACH-X (Abner Jenkins) vs. Jocasta
Moonstone (Karla Sofen) vs. Star Brand (Kevin Conner)
Jessica Jones vs. Iron Monger (Obadiah Stane)
Puff Adder vs. Cassandra Lang
X-Man (Nate Grey) vs. Boomerang
Darkstar (Laynia Petrovina) vs. Vulcan (Gabriel Summers)
Asp vs. Corsair
Dr. Octopus (Otto Octavius) vs. Ch'od
Quasar (Wendell Vaughn) vs. Ego the Living Planet
Black Mamba vs. Ghost Rider (Johnny Blaze)
Kraven the Hunter (Sergei Kravinoff) vs. Nico Minoru
Vindicator (Heather Hudson) vs. Terrax the Tamer
Princess Python (Zelda DuBois) vs. Magma (Amara Aquilla)
Dormammu vs. Maggott
Apocalypse vs. Nova (Sam Alexander)
Anaconda vs. The Punisher (Frank Castle)
Cypher (Doug Ramsey) vs. Whirlwind
Drax the Destroyer vs. Mesmero
Cottonmouth (Burchell Clemens) vs. Ant-Man (Scott Lang)
Sabra vs. Harry Leland
Groot vs. Bonebreaker
Corvus Glaive vs. Marrina
Chamber (Jonothon Starsmore) vs. Bison
Warlock (Technarchy) vs. The Melter
Proxima Midnight vs. Snowbird
Clea vs. Mastermind (Jason Wyngarde)
Boom-Boom vs. Klaw
Black Dwarf vs. Talisman (Elizabeth Twoyoungmen)
Namora vs. Sunstroke
White Tiger (Ava Ayala) vs. Pretty Boy
Supergiant vs. Puck (Eugene Judd)
Scorpion (Mac Gargan) vs. Raza Longknife
Franklin Richards vs. Lady Deathstrike
Ebony Maw vs. Shaman
Green Goblin (Norman Osborn) vs. Chase Stein
Rocket Raccoon vs. Donald Pierce
Marrow vs. Cyclone (Pierre Fresson)
Sabretooth vs. Molly Hayes
Kylun vs. Crossfire
Gamora vs. Selene
The Hulk (Amadeus Cho) vs. Zzzax
Strong Guy vs. Arkon
The Sentry (Robert Reynolds) vs. Machinesmith
Forge vs. The Chameleon
Oya vs. Constrictor (Frank Payne)
Rictor vs. Flying Tiger