History was made on Labor Day at the U.S. Open, where three moms advanced to the quarterfinals of a Grand Slam for the first time in the professional era.
Serena Williams, Tsvetana Pironkova and Victoria Azarenka all won fourth-round matches in New York in a first since at least 1968, win the Open Era began, according to the tournament.
Williams, the third seed seeking a 24th Grand Slam singles title, began the day by battling past Greek Maria Sakkari 6-3, 6-7 (6), 6-3. Williams has played at least one match at the U.