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Karolina Pliskova beats Naomi Osaka to win Tokyo crown

Karolina Pliskova beats Naomi Osaka to win Tokyo crown

Karolina Pliskova

US Open champion Naomi Osaka on Sunday was defeated in straight sets by Karolina Pliskova in the Pan Pacific Open final.

Osaka, who went down 6-4 6-4 to the Czech, blamed tiredness for the loss.

"I've literally never felt more tired in my entire life," said the 20-year-old.

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Meanwhile, the former world number one Pliskova ended Osaka's 10-match winning streak in just 63 minutes.

"Naomi was maybe a little bit tired, you could see that. But the future is bright for her and congrats to her for an incredible few weeks," said Pliskova.

Osaka's defeat came a fortnight after she won the US Open final, which was overshadowed by beaten opponent Serena Williams' outburst at an umpire.

Osaka could not recover after being broken by the world number eight in the fifth game of the first set and, as the strain began to show, she called for coach Sascha Bajin and groaned: "I feel so stressed out."

She could barely bring herself to speak at the trophy presentation.