I'll comment only on the Tennis aspect:
There is a clear changing of the guard going on in women's tennis. But I would not count Serena out of any tournament, even though she's made three early Grand Slam exits this year.
That said, Eugenie Bouchard and Simona Halep bear watching. The women's game, right now, is as wide open as it's been in a long time.
There are also some signs, milder but signs nonetheless, that the Big Four's (Nadal, DJokovic, Federer, Murray) grip on the men's game might finally be eroding. But that will take time, especially as long as DJokovic and Nadal are around.