The LocationThe fight takes place in random space.
The StoryThe Enchantress has been causing trouble for the Lords of Order and Dr. Fate has been sent to deal with her. Enchantress, aware of this has cast Thor under a spell to fight for her. When Doctor Fate finds the Enchantress he is soon attacked by Thor under Enchantress's spell. Thor of course has his hammer and while under the spell none of his fighting skills are impaired, and he is still able to call lightning down in space to aid him. Dr. Fate is unaware he is going to fight Thor, but he sees Thor charging straight for him.
The Rules1. No BFR.
2. They both see each other.
3. Thor has morals off. Doctor Fate has morals on.
4. This is post crisis Doctor Fate.
I don't think this fight has been done before, I tried searching Comic Vine and used Google but only found things like Silver Age Doctor Fate vs Rune King Thor or other alterations. Not sure if this is spite either, I don't know too much about either character.