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Pegula and Draper face Swiatek and Ruud in semi-final
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Defending champs Errani and Vavassori eye repeat run
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$1m prize at stake in revamped US Open mixed doubles
First set: Pegula/Draper 3-3 Swiatek/Ruud* (*denotes next server)
Pegula caps a love hold with a sharply angled volley into the tramlines. Still on serve in the opener.
