Lydia Jacoby's surprise gold highlights big day of swimming

Naomi Osaka, the Japanese star who lit the Olympic cauldron during Friday night’s Opening Ceremonies, lost to unseeded Marketa Vondrousova of the Czech Republic in the round of 16 of the women’s tennis tournament on Tuesday afternoon in Tokyo. Osaka, the tournament’s No. 2 seed and the second-ranked player in the world, was playing in her first event since she withdrew from the French Open in May because of mental health concerns. Follow along for live updates and highlights from the Games.

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