• AFP-Jiji, Reuters

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Four-time Grand Slam champion Naomi Osaka of Japan says she is building self-confidence and belief while trying to be less of a perfectionist on and off the tennis court.

The defending U.S. Open champion beat 87th-ranked Czech Marie Bouzkova 6-4, 6-1, in 93 minutes on Monday to reach a second-round matchup with Serbian qualifier Olga Danilovic.

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