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WASHINGTON — Just five games into the Citi Open final Sunday, Nick Kyrgios clutched at the middle of his back after a point. Soon, he was holding onto the chair umpire’s stand while trying to stretch.

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WASHINGTON — Just five games into the Citi Open final Sunday, Nick Kyrgios clutched at the middle of his back after a point. Soon, he was hold…

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WASHINGTON — Just five games into the Citi Open final Sunday, Nick Kyrgios clutched at the middle of his back after a point. Soon, he was holding onto the chair umpire’s stand while trying to stretch.