Serena and Venus Williams will clash in the semi-final of the Toronto Masters after the American sisters battled through three-setters in the quarter-finals on Friday.
World No.1 Serena outlasted Caroline Wozniacki to clinch a 4-6 7-5 7-5 victory while Venus also came from a set down to beat Spanish 14th seed Carla Suarez Navarro, the third round conqueror of Maria Sharapova, 4-6 6-2 6-3 in Montreal
Serena will take a 14-10 career lead over her older sister into Saturday's match.
The 32-year-old has won their last five meetings while Venus's most recent win was in Dubai in 2009.
Serena, who lifted her third Canadian crown last year when the tournament was held in Toronto, battled back from a set and a break down to claim victory over Wozniacki in two hours and 41 minutes.
"When you play someone like Caroline or other opponents, you know your match might be a little longer than normal," said Williams, who extended her career head-to-head record over the 13th-ranked Dane to 7-1.
Williams claimed her fourth title of the year at Stanford on Sunday, but she has disappointed in the majors this year, failing to add to her cache of 17 grand slam titles.
She'll get a last chance of 2014 to do so at the US Open, which starts in Flushing Meadows on August 25.
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