Simona Halep (#2) gets to the semifinals of the US Open for the first time in her career. It's also the third time she gets into the quarterfinals of a grand slam. The Australian Open is the only slam that she has missed to reach the semi's or more, for now.
Here was her path to the semi's -
1R: Marina Erakovic (NZL) (#99)
2R: Kateryna Bondarenko (UKR) (#104)
3R: Shelby Rogers (USA) (#154)
4R: Barbora Strycova (CZE) (#32)
QF: Victoria Azarenka (BLR) (#20)
SF: Flavia Pennetta (ITA) (#26)