Tony Soprano, sorry I wanted to say Toni Nadal.
Anyhow, forgetting the Tio Toni jokes, Djokovic's draw at the USO 2016 was easier. Crucially, Djokovic's Wimbledon 2018 draw was weaker than Nadal's US Open 2018 draw. Djokovic only had to face Kachanov, Edmund and Nishikori (on grass!) before facing Nadal. And then the famous Anderson. In what sense is that tougher than Nadal's draw? Nadal has to face Edmund, Kachanov, Anderson and DEL POTRO (better than Nishikori) before facing Novak. So since their draws are equal with the difference of Delpo being better than Nishikori, Nadal's USO 2018 draw >>> Djokovic's Wimbledon 2018 draw.
Think about it.