Djokovic, Nadal, Murray, Nishikori, in that order and no idea who to put 5th. I'll go with Vesely for his performance against Djokovic. He lost the next match against Monfils but gets major brownie points for beating Djokovic.
Yeah but you said 2016 and Stan has been appalling this year He was the same last year though till RG and look what happened then so who knows! The main crowning glory for clay tournament performance isn't far away so we can reassess after RG is over as that's really the only one that determines this.