Serena Williams is on track to win her seventh US Open title.
The American recorded an easy straight sets victory over Czech Karolina Muchova in their fourth round matchup.
Meanwhile second seed Ashleigh Barty is also through to the next round after beating Maria Sakkari.
Karolina Pliskova edged past Tunisia's Ons Jabeur to also make it to the next stage of the tournament.

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