Was sexism behind penalties given to Serena Williams at US Open finals?

Naomi Osaka has become the first Japanese tennis player to win a Grand Slam singles title, but the win has been overshadowed by a debate over double standards in the game.

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 tennis great Billie Jean King has joined fans in rallying around Serena Williams after she called out a double standard in the application of rules by umpires relating to female and male players.

Serena Williams' hopes of winning a 24th grand slam title were dashed after extraordinary scenes at the US Open.

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