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US Open Day Seven Thoughts: Team 'McCoco' Keeps Rolling While Serena, Federer Move on

NEW YORK — The bad news is that seven days of the U.S. Open are now in the books. The good news is that there are still seven days left of tennis, and we’re about to move into the business end of the year’s final Grand Slam.

Here are five thoughts on Sunday’s day session action.

— Coco Gauff’s singles tournament may have ended on Saturday night, when she was comprehensively beaten by No. 1 seed and defending champion Naomi Osaka, but Cocomania is still rampant. Everyone’s favorite 15-year-old teamed up with elder stateswoman Caty McNally, all of 17, to beat the No.