Naomi Osaka of Japan in action against Julia Goerges of Germany. Photo: REUTERS/Thomas Peter

BEIJING – Japan-born Naomi Osaka showcased the ruthlessness that won her the US Open over American Serena Williams in New York recently as the young Japanese sped into the China Open quarter-finals on Thursday.

The China Open is taking place in the capital city of Beijing.

The 20-year-old, who stunned Serena Williams to win her maiden Grand Slam last month, was devastating against 10th seed Julia Goerges of Germany, winning 6-1, 6-2 in 65 minutes.

Osaka, who is only the eighth seed in Beijing, similarly thrashed unseeded American Danielle Collins 6-1, 6-0 in the previous round.

She will face either home hope Zhang Shuai or three-time Grand Slam champion Angelique Kerber of Germany in the last eight.

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Osaka sprang a major upset when she defeated Williams in New York, in a final that was overshadowed by the American accusing the chair umpire of being "a thief" and "a liar".

Agence France-Presse (AFP)