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NYP20180909101_lg JOHN ANGELILLO/UPI/MAXPPP - Naomi Osaka of Japan holds the championship trophy at at the Top of the Rock observation deck in Rockefeller Center one day after defeating Serena Williams and winning the US Open Women's Final in New York City on September 9, 2018. Naomi Osaka won the 2018 US Open in straight sets and became the first Japanese woman in history to win a major singles championship.