It was an arduous battle, but Serena Williams came out on top to reach the US Open semi-finals for an 11th consecutive time. She defeated Bulgarian Tsvetana Pironkova 4-6, 6-3, 6-2.

For the first time in Grand Slam history three mothers made it to the quarterfinals of a major tournament. Two of them are Williams, 38, and 32-year-old Pironkova, who was playing her first tournament since 2017.

Williams will take the court again on Saturday, where she’ll take on Belarus’ Victoria Azarenka in the semifinals.

Azarenka upset Belgium’s Elise Mertens easily in straight sets in her quarterfinals match, winning 6-1, 6-0.

The all-Russian quarterfinal match at the US Open was a tight one on Wednesday. Daniil Medvedev, however, escaped in straight sets.

Medvedev beat Andrey Rublev 7-6 (8-6), 6-3, 7-6 (7-5), earning his spot in the semi-finals and keeping his quest to reach the championship match for the second-straight year alive.

The 24-year-old reached the first Grand Slam final of his career last year, though fell to Rafael Nadal in the championship.

He will take on Austria’s Dominic Thiem in the semi-finals on Saturday.

Thiem cruised to a win in his quarterfinals match on Wednesday night, flying past Australia’s Alex de Minaur in straight sets 6-1, 6-2, 6-4.

The win sent the 27-year-old to the semi-finals at the US Open for the first time in his career.