hmmm very interesting. I actually hadn't noticed Serena's serve was that strong at the YEC. Truth is, Serena's serve, when she still wants to, is the best in the game.
The question is, why doesn't Serena want to serve like that in a consistant basis, and if she does want to, why doesn't she??
her serve still has the best disguise, placement and speed imo. Her second serve was very deep and difficult to attack as well. She's still got it, hope she starts serving like her old self once she is healthy again!