His best chance ever, tbh. If old Fed does not take him out to get butchered in the final.
I can tell Djok is feeling a pressure. He knows that he won't have chances like this. I hope that doesn't affect him too much. He wasn't mentally strong in some big GS matches last and this year. Fed is very unpredictable these days imo. He can flop hard against some nobody, but he also can show his best. French Open 2011 is the best example. And Nadal didn't have such impressive clay court season this year, but he always shows his best in Paris.