I'm not sure..what kind of relation they have (Adidas and Novak). I really don't...
They, obviously make custom shoes for him..or that is some kind of special order from him..or whatever, because I noticed Novak Djokovic and 5 GS trophies insignia on shoes. But I do believe that they don't have any obligations or sponsorship agreement.
From my point of view..he can pick whichever shoes he wants to play in, but I really don't know.
And if I add his guys all in ST gear...I know that I know shit.
White socks? Which color would you choose?