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.

Karolina Pliskova beats Naomi Osaka to win Tokyo crown 

Karolina Pliskova beat Naomi Osaka to in Tokyo crown 

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Karolina Pliskova beats Naomi Osaka to win Tokyo crown

Karolina Pliskova beat Naomi Osaka to in Tokyo crown