After 16 years since her last Australian Open semi-final appearance, Venus Williams once again has a chance to go through to the Australian Open final if she defeats CoCo Vandeweghe tomorrow.
Meanwhile, on the other side of the draw, her sister Serena has the same opportunity if she can overcome Mirjana Lucic-Baroni. If both Williams sisters progress to the final it will be their ninth meeting in a Grand Slam singles final and their first since 2009, the exact amount of time needed to have passed to create an interesting narrative again.
Venus, 36, is now the oldest woman ever to reach the semi-finals at the Australian Open, and says she felt it was time.
"Truth is I was getting bored. I was watching some home movies from when Serena and I were just kids, playing together, showing off for mom and dad, winning Wimbledon, and I just got nostalgic. I called her (Serena) up and just said 'Hey girl, wanna catch up? Relive the old days?' and she was as excited as me," said Venus.
Serena spoke of her surprise to hear from her sister.
"I couldn't believe it. I was at home polishing my French Open and Australian Open trophies, y'know, the ones Venus doesn't have, when the phone rang.
"It was like a bolt of lightning out of clear sky! I mean, I hadn't played Venus in a Grand Slam singles final since Wimbledon in 2009, which I won, and it just seemed crazy.
"Of course we had to do it. I was so excited. I had to ring all the other girls on the (WTA) tour just to tell them that we'd both be trying again. Some were disappointed, some were excited for us, but they all understood."
Martina Hingis, another former world number 1 who is younger than Venus and played her last Australian Open singles tournament a decade ago, expressed happiness for her former rivals.
"Oh yeah, I remember them. From years ago, right? Good on them. I can remember the first time I played against Venus in a Grand Slam final clearly because the next day I watched the premiere episode of Ally McBeal.
"Yes, we played in a Grand Slam final before Ally McBeal."
Millions are expected to watch the final this weekend if the Williams sisters get through because, regardless of the victor, the real winner will be tennis (if that's how you interpret the continual domination of the tennis community by one family over 20 years).