September 6, 2018
Serena Williams reacts after winning a point against Anastasija Sevastova, of Latvia, during the semifinals of the U.S. Open tennis tournament, Thursday, Sept. 6, 2018, in New York. (Seth Wenig/AP)
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NEW YORK — Serena Williams was a bit shaky at the start of her U.S. Open semifinal. For all of six minutes.