Tennis - 2019 Nitto ATP Finals at The O2 - Day Seven<br />
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Semi Finals: Stefanos Tsitsipas (Greece) Vs. Roger Federer (Switzerland) <br />
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Roger Federer (Switzerland) with a quiet celebration after he rescues break point<br />
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COLORSPORT/DANIEL BEARHAM<br />
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COLORSPORT/DANIEL BEARHAM