At U.S. Open qualifying, the emotions of tennis spill over as players teeter on the edge

NEW YORK — A little after midday Friday, Zheng Qinwen, who has felt the weight of an Olympic gold medal around her neck and a Grand Slam final on her shoulders, collapsed on the green acrylic of Stadium 17 at the U.S. Open and roared with delight. In a match held over from Thursday’s thunderstorms a

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