Here are the results from the previous round:
Batman (Bruce Wayne) vs. The Huntress (Helena Bertinelli) 10-7
Superman (Kal-El) vs. Big Barda 13-4
Wonder Woman vs. Swamp Thing (Alec Holland) 9-8
Aquaman (Arthur Curry) vs. Nightwing (Dick Grayson) 5-14
You vote for the one who you like more, not who's the strongest one in a fight and have fun:
Superman (Kal-El) vs. Wonder Woman
Batman (Bruce Wayne) vs. Nightwing (Dick Grayson)