The current world No.1 and top seed said: "It's nice that it's happening". But I served pretty well in the service games, and then I got confident again. And her semi-final defeat by China's Li Na at Melbourne Park in 2011 when she had a match point counts among her most disappointing losses.
This championship match was the first in the Open era where the No. 1 and No. 2 players in the world met for a Grand Slam title with neither having already won a major.
She took out No. 4-seeded Elina Svitolina in straight sets in the quarterfinal but was struggling to match a consistent Wozniacki until late in the second set.
She then began grabbing at her left thigh after points, but somehow found the energy to break Wozniacki with a swashbuckling forehand down the line.
By the time Wozniacki sealed victory, Halep had added another two hours and 49 minutes to her tally.
She becomes the first Dane to win a Grand Slam title and she did so after a grueling encounter in searing heat.
Halep: "Well, I'm feeling ok". I think the most frustrating part was that when I was healthy I knew I can beat anyone. I slept a lot.
"I feel more experienced".
Wozniacki: "I'm excited. I'm actually feeling really good about it".
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Finally securing a Grand Slam was a relief for Wozniacki, who lost in the finals at the U.S. Open in 2009 and 2014. "I think you just learn all the time". With the win, Wozniacki also took over the No. 1 spot. 'A grand slam is your Olympic gold, basically. These are the moments we practice for, these are the moments we've prepared for our whole careers.
Wozniacki has become the first Danish Slam victor in history and has overtaken Halep to become the new World No.1 in the Women's Tennis Association rankings.
Wozniaki was ranked No. 1 for 67 weeks, including 49 straight from February 21, 2011 until Victoria Azarenka replaced her on January 30, 2012. "We both played very well".
The conditions were hot and humid when the match started with the temperature at 32 degrees Celsius (90 Fahrenheit). Whilst it is Halep whose weapons are far more damaging, this was clear to see in Halep's win over Kerber.
During the presentation ceremony Wozniacki twice apologised to Halep because she understood the pain she must be feeling. This is Halep's for the taking.
Soon after Halep signalled to her coach Darren Cahill in the player's box that she wasn't feeling well and there were worrying scenes as she had her blood pressure taken and an ice towel applied in the next changeover.
Both have improved the offensive parts of their game, with Wozniacki serving faster and hitting her forehand harder than a year ago. Runner-up Simona Halep of Romania reacts during a news conference after her women's singles final match.
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