MELBOURNE, JANUARY 27

American Danielle Collins showed she will provide a formidable obstacle to home favourite Ash Barty's hopes of winning the Australian Open with a crushing 6-4 6-1 defeat of Poland's Iga Swiatek to reach her first Grand Slam final on Thursday.

After Barty's demolition of American Madison Keys earlier, the 30th ranked Collins produced an equally dominant display to give former French Open champion Swiatek no chance.

World number one Barty will be the overwhelming favourite on Saturday as she attempts to become the first local to win the Australian Open since Chris O'Neil in 1978.

But the 28-year-old Collins, a product of the American college system and twice an NCAA champion, showed against Swiatek that she can mix it with the best.

She made a lightning start on Rod Laver Arena, overwhelming Swiatek with her power and aggression to race into a 4-0 lead.

Seventh seed Swiatek responded to claw back some of the damage but 28-year-old Collins held firm to close out the set.

It was a repeat show in the second set as a dominant Collins, who elected not to sit down at changeovers such was her eagerness to get the job done, again roared 4-0 ahead.

This time there was no counter-attack by Swiatek as Collins, showing no nerves as her date with destiny loomed, wrapped up victory on her second match point in 78 minutes.

"It feels amazing. It has been such a journey. It is so many years of hard work," Collins, who last April required emergency surgery for endometriosis, said on court.

"It is incredible to be on this stage, especially after all the health challenges. I couldn't be happier."

On trying to prevent Barty becoming the first Australian to claim the title for 44 years, Collins sounded undaunted.

"We've had some incredible battles over the years. To play the world number one in her home country will be spectacular," she said. "The energy the crowd will bring, whether it's for me or against me, it will be a incredible."