NEW YORK (AP) — Naomi Osaka smiled before her U.S. Open showdown against Coco Gauff began Monday — and after it ended. Between points, Osaka patted her left thigh and quietly told herself, almost in a whisper: “Come on. Come on.â€

Once the ball was in play, Osaka's strokes were loud and on-target, producing the sort of confident, consistent and power-swinging tennis that and the No. 1 ranking.

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