Defending champion Iga Swiatek clinched her place in the Indian Wells quarter-finals with a 6-1 6-1 thrashing of Karolina Muchova.
Poland's Swiatek is bidding to become the first woman to win the California tournament three times, having also sealed the title in 2022.
Swiatek's match against Muchova was delayed by almost an hour because of rain, but it then took her just 57 minutes to secure a dominant victory in which she did not face a single break point.
The world number two has dropped just six games on her way to reaching the last eight and will face China's eighth seed Zheng Qinwen next.
The 23-year-old five-time Grand Slam champion is the first woman to reach the Indian Wells quarter-finals for four consecutive years since Karolina Pliskova, who achieved the feat between 2016 and 2019.
Ukraine's Elina Svitolina and Russian Mirra Andreeva won to set up a quarter-final meeting.
Svitolina needed five hours, including a near three-hour rain delay, to beat American fourth seed Jessica Pegula 5-7 6-1 6-2, while ninth seed Andreeva saw off Kazakhstan's Elena Rybakina 6-1 6-2.
British lucky loser Sonay Kartal is due to face Belarus' world number one Aryna Sabalenka in the last 16 on Wednesday.