
In their lone previous meeting, Williams, right, beat Pliskova in California.

But saying she struggled with a knee injury, Williams wasn't at her finest.

She made 31 unforced errors and hit six double faults to lose 6-2 7-6 (7-5).

Pliskova reached her first grand slam final. For her part, her game was working, including the big serve.

Serena's loss meant Angelique Kerber wil rise to No. 1 in the rankings on Monday, ending Serena's long stay.

Kerber celebrated by beating Caroline Wozniacki 6-4 6-3 in the other semi.


