It's difficult nowadays to win a Grand Slam, even a career Grand Slam. With so much talent in the women's game, every player is hungry to win each of the slams - and of course, the level of playing nowadays is just so brutal to the body - be it in the men's or the women's game.
So it is a great achievement for Maria Sharapova to finally, finally achieve her career Grand Slam today, after winning over Sara Errani in the final of the French Open. Maria came into the final the favorite but of course, and she played at such a high level, she never allowed Sara a foot into the game! I guess she knew what Stosur's mistakes were - and didn't want that to happen to her.
Bravo Maria! You also now are the #1 player in the world - deservedly!