I don’t see why would his window close shortly. He said today himself that he is trying to make history and he is inspired by Federer playing this well at almost 38. And beside his elbow issues that have been resolved, he hasn’t had any serious health problems. He could easily go on for 4-5 more years and that’s 16-20 more grand slam opportunities. Him and Nadal only need few more to pass him.Djok is 32... Oh I see your point. I think Novak window will be closing shortly. Don't know if he catches Roger