Heavyweight Anthony Joshua spectacularly knocks out Robert Helenius with one punch in round seven, after boxing tentatively in the first half of the fight at London's O2 Arena.
Heavyweight Anthony Joshua spectacularly knocks out Robert Helenius with one punch in round seven, after boxing tentatively in the first half of the fight at London's O2 Arena.
Joshua beats Helenius with seventh round knockout
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Joshua beats Helenius with seventh round knockout
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