The sisters defeated the defending champions Sara Errani and Roberta Vinci 6-3, 6-1 to get closer to their 14th Grand Slam tournament title.
“It would mean so much and obviously, Serena’s doing so well in singles,” Venus Williams said. “For me, this is a chance for a U.S. Open title.”
Serena is still in the singles women’s tournament, where she will be looking to win back-to-back titles. The defending champ plays her semifinal Friday against China’s Li Na.
The Williams sisters will play their next doubles match against Andrea Hlavackova and Lucie Hradecka.