Australian Nick Kyrgios saved five matchpoints during a dramatic second-set tie-breaker to edge local hope Frances Tiafoe 6-7(5) 7-6(12) 6-2 and reach the semi-finals of the Citi Open in Washington. The Wimbledon runner-up appeared set for an exit when Tiafoe set up an opportunity to serve for the win during the second set tiebreaker, but

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