American number one Isner toppled by taller Opelka

United States number one John Isner was sent crashing out of the first round of the Australian Open on Monday by compatriot Reilly Opelka 7-6(4) 7-6(6) 6-7(4) 7-6(5) in a battle of two of the game's tallest players.

American number one Isner toppled by taller Opelka

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