Tennis - 2017 Nitto ATP Finals at The O2 - Day Five<br /> <br /> Group Boris Becker Singles: Alexander Zverev (Germany) Vs Jack Sock (United States)<br /> <br /> Alexander Zverev (Germany) hides his face behind his hands in disbelief at his play at the O2 Arena<br /> <br /> COLORSPORT/DANIEL BEARHAM
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