Serena defeats Venus to move within two victories of her first calendar Grand Slam.
The world number one held her nerve to win 6-2 1-6 6-3 and reach the semi-finals in New York.
Williams will now play unseeded Roberta Vinci on Thursday
Today's quarter finals
| Women's Singles - Quarterfinals | |
| Petra Kvitova (CZE) [5]
vs.
Flavia Pennetta (ITA) [26] |
|
| Women's Singles - Quarterfinals | |
| Victoria Azarenka (BLR) [20]
vs.
Simona Halep (ROU) [2] |
|
