The Men's game looks in a healthy place. Federer is at the end of the greatest career. Nadal is uncertain about his fitness probably because of the brutality he brought to tennis from the start. He either has to take a longer break or change the way he plays - neither easy. Djokovik is immense and Murray has arrived. Del Potro is a joy to behold but also injury prone and there are plenty of would-be players waiting.
The Women's game has one great player - Serena Williams - and no pretenders to her throne. How long will she go on for? She has never chased the tournament year preferring to dip in and dip out so certain is she of her outstanding ability. If she wins the US Open then she'll not change her plans but if she loses she may decide to play one more year and then quit.