Tennis - 2017 Nitto ATP Finals at The O2 - Day Five<br /> <br /> Group Boris Becker Singles: Roger Federer (Switzerland) Vs Marin Cilic (Croatia)<br /> <br /> A wider angle of Roger Federer (Switzerland)serving to Marin Cilic (Croatia) at the O2 Arena<br /> <br /> COLORSPORT/DANIEL BEARHAM
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