Short of No. 24 again, Williams loses to Azarenka at U.S. Open

Victoria Azarenka, of Belarus, reacts after defeating Serena Williams, of the United States, during a semifinal match of the US Open tennis championships, Thursday, Sept. 10, 2020, in New York. (AP Photo/Seth Wenig)

NEW YORK — Serena Williams already was struggling to keep up in a fast-paced U.S. Open semifinal when she stopped behind the baseline after a third-set point and leaned over. She held that pose for a bit, then clutched at her lower left leg and asked for a trainer.