If the Nole of the first match was playing the Fed of the second match today he would have won with no difficulty. Look at the RF stats, 5 df, 54% first serve %. But it doesn't work that way. I charitably believe that Fed was saving his best for tomorrow's final. If Nole plays the way he did today, it should be a great one.
Stan W. certainly played well but most of the time he had to contend only with Federer's B game. Fed upped it when necessary but it was nothing like the performance he gave against Mardy Fish last night.
Del Potro did OK but he only once, as I saw it, got his signature forehand blast going. At other times it went wide or into the net. He had some nice volleys but otherwise he was less than his best.