The 16-year-old arrived at the tournament with a world ranking of 279 but she dominated the two-time Australian Open winner, racing into a 6-2, 3-0 lead before the veteran Belarusian quit.
Azarenka, 32, who broke down in tears during her defeat to Elena Rybakina at Indian Wells earlier this month, looked out of sorts throughout against the impressive Fruhvirtova.
It was not immediately clear why Azarenka retired.
"I don't know what happened at the end," Fruhvirtova told AFP.
"She was struggling with some injuries. Читать дальше...