Iga Swiatek of Poland celebrates after defeating Emma Navarro of the U.S. in their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia.

Iga Swiatek of Poland signs autographs after winning her quarterfinal against Emma Navarro of the U.S. at the Australian Open tennis championship in Melbourne, Australia.

Iga Swiatek, left, of Poland, is congratulated by Emma Navarro of the U.S. following their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia.

Iga Swiatek of Poland plays a forehand return to Emma Navarro of the U.S. during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia.

Emma Navarro of the U.S. plays a backhand return to Iga Swiatek of Poland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia.

Iga Swiatek of Poland plays a backhand return to Emma Navarro of the U.S. during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia.

Iga Swiatek of Poland plays a backhand return to Emma Navarro of the U.S. during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia.

Emma Navarro of the U.S. runs to make a backhand return to Iga Swiatek of Poland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia.

Iga Swiatek of Poland serves to Emma Navarro of the U.S. during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia.