Spain's Muguruza advanced when her semi-final opponent Victoria Azarenka was forced to pull out with a back injury.

Kvitova beat Jessica Pegula 6-4 6-4, winning the final four games after trailing 4-2 in the second set, to set up a rematch of the 2018 final in Doha, when the Czech beat Muguruza in three sets..

"I was just trying to get back to the rhythm which I lost after the first set and I'm really glad that I found a way," Kvitova said.

Pegula, who reached the quarterfinals at last month's Australian Open, was playing her seventh match in as many days after coming through qualifying in Doha.

"She is a very solid player from the baseline, and as we saw she can play some volleys as well, so it was very difficult," Kvitova said.

Kvitova will play in her first final since last year's Qatar event, when she lost to Aryna Sabalenka.

Azarenka hurt her lower back while warming up for her quarterfinal match against top-seeded Elina Svitolina on Thursday and was not fit to take her place in the last-four.

It gave Muguruza a walkover into her second final of the season after losing to Australia's Ash Barty in the Yarra Valley Classic final last month.

Australian Associated Press