Ares

As the Olympian God of War, Ares is one of the most brutal and fearsome warriors of all time. He is a genius-level military tactician and a master of all weaponry, both ancient and modern. Though his half-brother Hercules may be stronger, Ares is meaner, and he isn't shy about demonstrating it.

Earth's Mightiest
Hawkeye defeated Ares in the opening round.