Wonder Woman vs Thor
Disclaimer: I own neither Thor nor Wonder Woman. They belong to their respective franchises.
Diana was out on a mission for the Justice League, into a strange place. It was an island, and it's properties and inhabitants were unknown. She began to scout around the area.
All of a sudden, she saw a hammer speeding in her direction. She dived out of the way, and stayed put for a few seconds. A voice then thundered "Who are you, and why are you here?"
Diana saw a man with a crimson cape and a hammer.
She got up, and said "I am Wonder Woman, of Themyscira. What is your business in the place."
The man got up and said "I am Thor, of Asgard, and you must be one of my enemies."
Before Diana could speak, the hammer came flying back from behind her, and smashed her on the head. Groaning, she staggered to the side, a major bump growing on the side of her head. She pulled out her lasso, and quickly jumped out of the way. Looking back, she saw the hammer break a tree next to where she just was.
"Your hammer is extremely quick, but let's see how you fare against the lasso of truth, and MY might. Thor threw his hammer once again, but this time Wonder Woman was ready. She threw her lasso, looping it around the hammer, and hurled it far off to the side.
Then, she got arrogant, saying "Let's see what you are WITHOUT that hammer," and charged forward. This proved to be the decisive mistake. If she had paused to reflect, she would have realized that Thor had control over his hammer.
Immediately, the hammer came flying back, smashing her on the head just as she was about to punch Thor. This was too much for her already weakened state, and she immediately slumped to the ground, unconscious.
Thor glanced backwards once at her as he flew off into the distance.