September 4, 2018
Serena Williams, right, of the United States, shakes hands with Karolina Pliskova, of the Czech Republic, after Williams’ 6-4, 6-3 win during the quarterfinals of the U.S. Open tennis tournament Tuesday, Sept. 4, 2018, in New York. (Adam Hunger/AP)
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NEW YORK — Serena Williams began her U.S. Open quarterfinal tentatively. Her shots lacked their usual sting, her attitude its usual conviction.