World No. 1 Caroline Wozniacki vs. Former World No. 1 Serena Williams. It sickens me to put that No. 28 next to Serena's name, by the way.
No. 9 Samantha Stosur vs. Angelique Kerber
The easiest story to begin with is Kerber's. What a dream Grand Slam for the 23-year old German who is ranked No. 92 in the world. This is BY FAR the biggest accomplishment of her career as she had never before made it past the third round of any Grand Slam event. Ever. Of course the stars had to align for her as she played in the same bracket with No. 3 Maria Sharapova and No. 5 Petra Kvitova who lost in the third round and first round, respectively. In other words, Kerber made it to the semifinals without having to play a Top 10 player along the way. But nonetheless, kudos to the young lady on her dream Grand Slam run.
As for Stosur, this is her best showing ever at the U.S. Open, topping her quarterfinals appearance from last year.
As for No. 1 Wozniacki, she's inching closer to her first-ever Grand Slam title. This is her third consecutive year in the semis, so she always performs well here in Flushing, Queens, NY. But will she find a way to get past the brick wall that awaits her in the semis? It ain't gonna be easy, that's for sure.
And last but not least, there's Serena. I wonder how many other No. 28 seeds have ever reached the semifinals without dropping a single set?