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The 21-year-old Japanese had a shaky start when
she was broken early in the first set but quickly found her
groove and broke the American four times and struck 29 winners
to advance.
The U.S. and Australian Open champion, who is also defending the
title at Indian Wells, will next face Switzerland's Belinda
Bencic, who beat Ekaterina Alexandrova 6-4 6-2.
The duo were joined in the fourth round by seven-times Grand
Slam champion Venus Williams, who defeated qualifier Christina
McHale 6-2 7-5.
The 38-year-old Williams, who showed her mettle in the second
round where she upset world number three Petra Kvitova, will
meet unseeded German Mona Barthel in the fourth round.
"I feel definitely more comfortable going into that match than,
for example, today," Williams told reporters.
"I had never played (McHale) before, so you feel like you don't
really know what's going to happen.
Earlier, Latvian 11th seed Anastasija Sevastova became the
latest player to be stuck down with a viral illness at the
tournament.
Sevastova was down 5-0 in the first set of her third round match
with Estonian 21st seed Anett Kontaveit when she retired.
Her departure came less than 24 hours after Serena Williams was
unable to continue her match on Sunday, also citing a viral
illness.
Men's third seed Alexander Zverev also said on Monday after
losing to fellow German Jan-Lennard Struff that he too had a
virus.
Among those women still feeling healthy, three-times grand slam
champion Angelique Kerber battled back to beat Russian qualifier
Natalia Vikhlyantseva 3-6 6-1 6-3.
Kerber took a while to warm to her task on a cool morning in the
California desert.
"She was playing really fast and flat, so that was something I
was not really expecting," the German said of her opponent.
"I was trying to adjust, especially with my movement at the end
of the first set and beginning of the second, and I think that
was the key to coming back."
Fifth seed Karolina Pliskova was not at her very best but still
prevailed 6-3 6-2 over Ysaline Bonaventure.
"I felt somehow strange and the match was strange," said
Pliskova.
(Reporting by Andrew Both in Cary, North Carolina and Jahmal
Corner in Los Angeles; editing by Ken Ferris/Greg Stutchbury)
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