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Notable upsets in tennis over the years

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Naomi Osaka defeats Serena Williams – 2018 US Open, Final

Twenty-year-old Osaka thwarted Williams' chance of winning her seventh US Open, as she won 6-2, 6-4, at the women's final. In turn, Osaka became the first Japanese to win a Grand Slam title in history. During the game, Williams got embroiled in a heated argument with chair umpire Carlos Ramos over code violations and penalty points.
© Timothy A. Clary/AFP/Getty Images
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