Venus Williams swept aside Germany's Mona Barthel to reach the quarter-finals for the Australian Open for the seventh time.
The 36-year-old seven-time Grand Slam champion won 6-3 7-5 in Melbourne.
Williams - the oldest player in the women's singles - next faces Anastasia Pavlyuchenkova, who beat fellow Russian Svetlana Kuznetsova 6-3 6-3.
World number one and defending champion Angelique Kerber plays American Coco Vandeweghe later on Sunday.
Seventh seed Garbine Muguruza of Spain plays Romanian Sorana Cirstea in the remaining match in the top half of the draw.
- Watch highlights of day seven on BBC Two from 17:15 GMT on Sunday.