After playing the hell out of Metal Gear Rising: Revengence, I had to make this topic.
Both are fully upgraded and Raiden has access to his 'Ripper Mode'.
Both are at full power
They start off a 200 meters away
Fight takes place in Manhattan, overrun with Infected.
Win by Death or K.O
NOTE: This is Mercer from Prototype 1. Nothing of Prototype 2 exists here.