Here are the results from the last round:
Jean Grey vs. Black Widow (Natasha Romanova) 49-28
Groot vs. Thanos 38-39
Dr. Strange vs. Quicksilver 48-28
Storm vs. Rogue 42-35
You vote for the one who you like more, not who's the strongest in a fight and have fun:
Storm vs. Thanos
Jean Grey vs. Dr. Strange