NEW YORK (AP) — Serena Williams was upset in the U.S. Open semifinals for the second year in a row, beaten 6-2, 7-6 (5) by 10th-seeded Karolina Pliskova of the Czech Republic on Thursday night.
Williams, who clutched at her left hamstring occasionally in the second set, double-faulted to end it.
The loss prevents Williams from earning her seventh championship at Flushing Meadows and 23rd major title overall, which would both have been Open-era records.
It also means Williams’ 3½-year reign at No. 1 in the WTA rankings will end. She will be overtaken on Monday by current No. 2 Angelique Kerber, who plays Caroline Wozniacki in Thursday’s second semifinal.
A year ago, Williams’ bid for a calendar-year Grand Slam ended when she lost in the U.S. Open semifinals to unseeded Roberta Vinci of Italy in the semifinals.
Pliskova advances to her first major final.