Serena and Venus Williams added another chapter to what the world number one claims to be greatest story in tennis when she outslugged her sister 6-2 1-6 6-3 on Tuesday to reach the semi-finals of the US Open.
There are few that would disagree with Serena that the Williams sisters' rise from the hard scrabble streets of Compton to the top of the tennis world is both fascinating and inspiring.
But it is a story still being written and what is unfolding at Flushing Meadows this fortnight could well provide a chapter all its own with plot centering around what was an enthralling 27th meeting between the siblings.
"I think it's the greatest story in tennis because we really - you know, with our how we started and how we grew up and how we were able to win championships and be, you know, such inspirations for so many women across the globe, I mean, it doesn't get better than that," said Serena.
Certainly Serena seemed inspired on Tuesday as she and Venus played with the fire and passion that had been missing from many of their other 26 head-to-head meetings.
But never before had so much been riding on the result.