World number one and defending champion Serena Williams dropped just four games as she thrashed Agnieszka Radwanska in 64 minutes to reach the Australian Open final.
The American won 6-0 6-4 under the Rod laver Arena roof, with rain pouring down outside at Melbourne Park.
Williams, 34, is trying to win her seventh Australian Open and 22nd Grand Slam title.
She will play Briton Johanna Konta or German Angelique Kerber in the final.
Radwanska, 26, came into the semi-final as the fourth seed and on a 13-match winning run, but had lost all eight previous meetings with Williams.