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Alexander Zverev
John Isner

Alexander Zverev
John Isner

Third seed Alexander Zverev and No. 8 seed John Isner went head-to-head at the Nitto ATP Finals in their last match in the Gustavo Kuerten Group .A win for Zverev would be enough to see him through to the semi-finals while Isner needed a straight sets victory to keep his hopes alive  - watch the full replay from the O2 Arena.