Tennis - 2019 Nitto ATP Finals at The O2 - Day Seven<br />
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Semi Finals: Dominic Thiem (Austria) Vs. Alexander Zverev (Germany)<br />
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A defiant looking Alexander Zverev (Germany) looks across to his bench for some inspiration<br />
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COLORSPORT/DANIEL BEARHAM<br />
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COLORSPORT/DANIEL BEARHAM