Karen khachnov of the Russian eleminate and US open Nick Kyrgios  at semi final

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Khachnov was the stronger player in the first of fifth set

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The Russian was too strong in the best win in his career

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Khachnov jumps out to the 3-1 lead in the 5th

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The Kyrgios serve comes back with a vengeance.

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Three bomb from Kyrgios   get him the game 

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The Aussie and Kyrgios both are playing strongly.

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Kyrgios injured on knee and called for a medical treatment

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Kyrgios flexing his knee worryingly 

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Games are very comfortable for servers.

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