The Latest: Serena Williams in US Open quarterfinal action

NEW YORK (AP) — The Latest on the U.S. Open tennis tournament (all times local):

12:15 p.m.

Serena Williams is about to start her U.S. Open quarterfinal against unseeded Tsvetana Pironkova.

Williams is seeking her seventh championship at Flushing Meadows and record-tying 24th Grand Slam singles title overall.

Pironkova is a 32-year-old from Bulgaria who is playing in her first tournament since she took a break of more than three years while having a son.

The other women’s quarterfinal on Wednesday’s schedule is No. 16 seed Elise Mertens against unseeded Victoria Azarenka, who has a nine-match winning streak.

The men’s quarterfinals Wednesday are No. 2 seed Dominic Thiem against No. 21 Alex de Minaur and No. 3 Daniil Medvedev against No. 10 Andrey Rublev in an all-Russian matchup.

Medvedev was the runner-up in New York last year.

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