Got an ID update, figured out the other tune he used in the mashup with Sin City.

So it's:
Dakota - Sin City (Rex Mundi Remix / Markus Schulz Edit)
Dennis Sheperd & Cold Blue - Freefalling (Dennis Sheperd Dub)

which makes:

11. Dakota vs. Dennis Sheperd & Cold Blue - Freefalling Sin City (Markus Schulz Mashup)