World No. 1 Ash Barty came from a set down to beat American Danielle Collins 3-6, 6-1, 7-6 (5) in the Adelaide International semifinals on Friday.

Barty will meet world No. 24 Dayana Yastremska in Saturday's final after the 19-year-old Ukrainian beat Aryna Sabalenka 6-4 7-6 (4).

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Danielle Collins of the United States receives treatment during her game against Ashleigh Barty of Australia during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

World No. 1 Ash Barty came from a set down to beat American Danielle Collins 3-6, 6-1, 7-6 (5) in the Adelaide International semifinals on Friday.

Ashleigh Barty of Australia celebrates winning against Danielle Collins of the United States during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

“It was probably my first real taste (this year) of some adrenaline late in matches," Barty said. "And that is what we're after, to try and practice those things as best we can. I felt like I did what I wanted to do well tonight and got over the line."

Danielle Collins of the United States serves against Ashleigh Barty of Australia during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

In the men's draw at Memorial Drive, South African Lloyd Harris reached his first ATP final by defeating fellow qualifier Tommy Paul 6-4, 6-7 (3), 6-3.

Ashleigh Barty of Australia celebrates winning against Danielle Collins of the United States during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Ashleigh Barty of Australia celebrates winning against Danielle Collins of the United States during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Ashleigh Barty of Australia celebrates winning a point against Danielle Collins of the United Sates during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Ashleigh Barty of Australia celebrates winning a point against Danielle Collins of the United Sates during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Ashleigh Barty of Australia takes a break against Danielle Collins of the United Sates during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Ashleigh Barty of Australia takes a break against Danielle Collins of the United Sates during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Collins was bothered by a back injury in the final set. She received treatment and was able to continue.

Danielle Collins of the United States receives treatment during her game against Ashleigh Barty of Australia during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Danielle Collins of the United States receives treatment during her game against Ashleigh Barty of Australia during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

“It was probably my first real taste (this year) of some adrenaline late in matches," Barty said. "And that is what we're after, to try and practice those things as best we can. I felt like I did what I wanted to do well tonight and got over the line."

Barty beat Yastremska in their only previous meeting last year in Miami.

"I had a good preseason, I worked on a lot of things and I think that's paying off ... each game, I'm playing better and better," Yastremska said.

Ashleigh Barty of Australia celebrates winning against Danielle Collins of the United States during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Ashleigh Barty of Australia celebrates winning against Danielle Collins of the United States during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

In the men's draw at Memorial Drive, South African Lloyd Harris reached his first ATP final by defeating fellow qualifier Tommy Paul 6-4, 6-7 (3), 6-3.

More AP tennis: https://www.apnews.com/apf-Tennis and https://twitter.com/AP_Sports

Danielle Collins of the United States serves against Ashleigh Barty of Australia during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Danielle Collins of the United States serves against Ashleigh Barty of Australia during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Ashleigh Barty of Australia celebrates winning against Danielle Collins of the United States during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Ashleigh Barty of Australia celebrates winning against Danielle Collins of the United States during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Ashleigh Barty of Australia celebrates winning a point against Danielle Collins of the United Sates during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Ashleigh Barty of Australia celebrates winning a point against Danielle Collins of the United Sates during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Ashleigh Barty of Australia takes a break against Danielle Collins of the United Sates during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)

Ashleigh Barty of Australia takes a break against Danielle Collins of the United Sates during their Adelaide International tennis match in Adelaide, Friday, Jan. 17, 2020. (AP PhotoJames Elsby)