Superman vs Mongul
This is Mongul with his SC rings. Both combatants are naked, but soft (assume Superman can't get hard for battle).
They fight in a nice jungle right off the coast of Costa Rica. There is wildlife everywhere, and a nice cool breeze flows through it. Sometimes you can hear monkeys reproducing in the background. There is not a cloud in the sky, and the sun is shining brightly (assume Superman doesn't get another powerup by it though). Birds are flying overhead, and somewhere Willem Dafoe is eating an animal.