Naomi Osaka became the first Japanese tennis player to win a Grand Slam title on Saturday, defeating her childhood idol, Serena Williams, in straight sets at the U.S. Open in New York. But it was Williams, seeking her first major championship since giving birth to her first child, who stole the show, smashing her racket in an epic meltdown that culminated in her accusing the umpire of sexism. Early in the second set, umpire Carlos Ramos warned Williams after he caught her coach allegedly giving her hand signals from the stands. A teary-eyed Williams denied receiving coaching while chewing out Ramos, then proceeded to smash her racket on the court and demand that Ramos apologize to her while calling him a "thief," which resulted in her losing a point and then a game to penalties. "I've seen other men call other umpires several things," Williams, who has a history of outbursts at the U.S. Open, said afterward. "I'm here fighting for women's rights and for women's equality and for all kinds of stuff. For me to say 'thief' and for him to take a game, it made me feel like it was a sexist remark. He's never taken a game from a man because they said 'thief.'"