New York - Serena Williams, chasing her 24th Grand Slam title to match Margaret Court's all-time record, advanced to the fourth round of the US Open on Friday by defeating Czech Karolina Muchova 6-3, 6-2.
The 37-year-old American, seeking a seventh US Open title, will next face Croatian 22nd seed Petra Martic.
US Open results on Friday (x denotes seeding):
Men
3rd rd
Roger Federer (SUI x3) bt Dan Evans (GBR) 6-2, 6-2, 6-1
Alex de Minaur (AUS) bt Kei Nishikori (JPN x7) 6-2, 6-4, 2-6, 6-3
Women
3rd rd
Johanna Konta (GBR x16) bt Zhang Shuai (CHN x33) 6-2, 6-3
Karolina Pliskova (CZE x3) bt Ons Jabeur (TUN) 6-1, 4-6, 6-4
Serena Williams (USA x8) bt Karolina Muchova (CZE) 6-3, 6-2
Petra Martic (CRO x22) bt Anastasija Sevastova (LAT x12) 6-4, 6-3
Ashleigh Barty (AUS x2) bt Maria Sakkari (GRE x30) 7-5, 6-3