DISCLAIMER: I do not own the Avengers or the Justice League.
Thor stood at the deck of the helicarrier. Tony Stark had been brought back alive, but had failed to catch the Batman, having been stopped by the Green Lantern. Spiderman stood on the deck nearby, watching the buildings go by underneath. Thor sensed someone nearby, and looked up to see a woman in a suit of armour that somewhat resembled a corset.
The woman approached, and as she did, the Batman appeared from nowhere behind her. The woman, Wonder Woman as Thor believed her to be called, approached Thor, while the Batman prepared to face Spiderman. Thor threw himself forward, smashing into Wonder Woman and launching them both off the deck and into the air. Wonder Woman wrapped her whip around Thor and tried to pull him in, but Thor sent lightning pulsing along the length of the whip, electrocuting her badly.
Detaching the whip from Thor, Wonder Woman flew away, flinging her tiara at him. Thor caught the tiara, feeling its razor-sharp edge cut his hand slightly. Wonder Woman readied her sword and shield, charging at Thor, while Thor flung his hammer into Wonder Woman's face, launching her back several hundred metres. Wonder Woman recovered just in time to avoid being hit with a bolt of lightning Thor sent her way. She then flew back at him, swinging her sword at him. Thor parried the sword with his hammer, before slamming his hammer onto her shield, launching both of them back.
Thor fired a storm at Wonder Woman, while Wonder Woman dodged every attack the sky sent her way, before flying at Thor with her sword. Thor caught the sword on his hammer, pulsing a bolt of lightning into the hammer and through the sword, and therefore through Wonder Woman. Wonder Woman threw herself back, flinging her tiara at Thor again, having reclaimed it when Thor had dropped it. Thor smacked the tiara aside with his hammer, before flinging the hammer into Wonder Woman's face, pulsing lightning into it as he did so.
Wonder Woman recovered to see that Thor, already holding the hammer again, stood right in front of her. As she prepared to defend herself, Thor slammed his hammer into her face, before punching her in the chest, and then slamming his hammer down on the top of her head. Thor then gripped the dazed Wonder Woman and flew up into the sky, creating an electric cyclone around himself and his victim. In the air, Thor struck Wonder Woman repeatedly with his hammer, feeling her solid bones actually crack under the force.
Thor then sent both himself and Wonder Woman down to the ground at amazing speeds, causing the empty field to turn into a large crater, the entire cyclone boring into the ground, and into Wonder Woman. When the cyclone had faded, Wonder Woman lay on the ground, Thor's hammer planted on her chest, holding her down on the ground. Wonder Woman tried to move the hammer, but it seemed heavier than the world itself. Thor stepped up to her, picking up the hammer, and slamming it into Wonder Woman's face, stunning her.
Reasons for this outcome:
1. While Thor and Wonder Woman are fairly similar in terms of strength and speed, Thor's superior durability gives him an advantage in this fight.
2. Wonder Woman is armed in a fairly similar fashion to Thor, but possesses no energy attacks, which makes Thor's lightning a huge advantage over her.
