Serena Williams's US Open final breakdown

Serena Williams of the United States plays Naomi Osaka of Japan during the U.S. Open final in New York on Sept. 8, 2018. Source: Kyodo via AP Images
US Open 2018 Naomi Osaka wins. Serena Williams accused the umpire of being a 'thief'. What happened at the Women's final explains tennis expert Piotr Haczek.
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