Her dramatic 7-6 (2), 3-6, 6-4 win over Simona Halep was punctuated by two fantastic baseline rallies on the final two points of the match, where the 27-year-old from Denmark incredibly kept the rallies alive with scampering saves from the baseline, especially the second-to-last point of the match that set up her first and only match point.
Second seed Wozniacki, who won the season-ending WTA Finals in Singapore for the first time in her career, said: "Whoever wins on Saturday will be top of the world rankings, so it's a cool storyline".
Former No. 1-ranked Wozniacki is potentially one win away from a breakthrough Grand Slam title after advancing 6-3, 7-6 (2) over Elise Mertens on Thursday.
After two US Open final defeats, many thought Wozniacki might never get another chance to win a grand slam, let alone return to the top of the WTA standings.
Caroline Wozniacki had a brilliant start to the day as she held her own service game and then broke Halep to go up 2-0 in the first set. "I'm going to cry". "I'm just waiting for the question, 'when are you going to win the second one?"
But even after Halep went up, Wozniacki broke Halep back to level the match again.
However, anyone thinking that this would be a positive for Halep needs to think again - the Romanian is also 0-2 in Slam finals, and was a much shorter price than Wozniacki in both, including starting at [1.33] against Jelena Ostapenko in Paris at the French Open past year.
" I am taking a second to hug Daphne (the trophy)". I'm really sad I couldn't win it.
It's taken her 11 years, 43 majors, 256 tournaments, 772 matches and untold hours of toil and tears to shed her tag as tennis's most accomplished talent without a grand slam win.
"I think players sometimes, they just get so frustrated".
While she is in this sort of form, you couldn't bet against her doing it. Halep had two matches ahead of the final where she faced match points, while Wozniacki only had one encounter.
In the women's wheelchair singles final, top seed Yui Kamiji failed in her bid to defend her title, losing 7-6, 6-4 to No. 2 seed Diede de Groot of the Netherlands.
In her victory speech on court, Wozniacki appeared to be doing a routine round of thanks to those close to her.
"I can still smile", she said.
"I want to congratulate Caroline".
During the presentation ceremony Wozniacki twice apologised to Halep because she understood the pain she must be feeling.
She later admitted thinking "it looks like it may not be my day" but she didn't let on, showing an abundance of grit and desire in the penultimate point of the match.
The final pits two of the best players never to have won a Grand Slam against each other, with a major title on the line.
The 27-year-old was so almost out of the tournament in the second round, trailing 5-1 in a third set to Jana Fett and having to save a pair of match points.
"I had a great year (last year)".
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