Stan Wawrinka progressed on day seven of the 2019 US Open after Novak Djokovic retired hurt. Photo: USA Today

US Open: Stan Wawrinka advances as injury fells defending champ Novak Djokovic

Topic |   US Open (tennis)

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Stan Wawrinka progressed on day seven of the 2019 US Open after Novak Djokovic retired hurt. Photo: USA Today
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