Serena and Venus Williams are one win away from clashing in the Wimbledon final for an incredible fifth time.
Top-ranked Serena stepped up her title defence with a steely-eyed 6-4 6-4 quarter-final win over Anastasia Pavlyuchenkova after Venus advanced to the last four at the All England Club for the first time in seven years with a 7-6 (7-5) 6-2 defeat of Yaroslava Shvedova.
Serena finished off Pavlyuchenkova with her eighth ace after just 73 minutes and next faces another Russian in the unseeded Elina Vesnina, who ousted Slovakian 19th seed Dominika Cibulkova 6-2 6-2.
Continuing her extraordinary tennis renaissance, 36-year-old Venus is the oldest player to reach the Wimbledon last four since Martina Navratilova in 1994.
Sixteen years after winning her first of five crowns on London's hallowed grass courts, and five years after being diagnosed with Sjogren's syndrome, Venus will play Australian Open champion Angelique Kerber on Thursday for a place in Saturday's title match.