Re: "Every generation is better than the previous one. The game is always evolving"
I don't think you can say every generation is better than the last one. But once in a while, there comes a generation that lifts the bar. Monica Seles is often thought of as a transformational player in the women's game because she brought power on both wings and a strong baseline game.
The generation of Pierce, Capriati, Davenport, Williams, Clijsters, Henin etc... all took this concept to the next level. That's why the early 2000s is often seen as a sort of Golden Age in women's tennis.
Before, Seles was the only one hitting like that. Now you have to hit like her to win slams. That's where Hingis fell behind because she couldn't keep up when the bar got lifted even though she herself actually improved.
So until another generation comes along that lifts the bar like that, I'd say that generation is the standard.
And as Serena was the last woman to hold all four majors and doing so during that period, I guess that makes her by default the standard female tennis player as well. I mean, let's face it, which female player wouldn't kill to have a serve like that?