Venus Williams beat Coco Vandeweghe at the Australian Open to reach her first Grand Slam final for eight years.
The 36-year-old fought back to see off her fellow American 6-7 (3-7) 6-2 6-3 in Melbourne, setting up a potential final against her sister Serena.
Venus Williams, seeded 13th, lost to her sister in her only previous Australian Open final 14 years ago.
Serena Williams plays unseeded Croat Mirjana Lucic-Baroni in the second semi-final.
A victory for the world number two would set up the ninth all-Williams final at a Grand Slam - the last of which, at Wimbledon in 2009, was Venus's most recent major singles final.