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Alexander Zverev can challenge Federer in Halle, says tournament director | Alexander zverev, Roger federer, Tennis players
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Roger Federer progresses to quarters after straight set victory over Mischa Zverev in Halle - Eurosport
![Halle, Germany. 23rd June, 2017. Roger Federer of Switzerland returns the ball during the men's singles quarterfinal match against Florian Mayer of Germany in the Gerry Weber Open 2017 in Halle, Germany, Halle, Germany. 23rd June, 2017. Roger Federer of Switzerland returns the ball during the men's singles quarterfinal match against Florian Mayer of Germany in the Gerry Weber Open 2017 in Halle, Germany,](https://c8.alamy.com/comp/JEDB3J/halle-germany-23rd-june-2017-roger-federer-of-switzerland-returns-JEDB3J.jpg)
Halle, Germany. 23rd June, 2017. Roger Federer of Switzerland returns the ball during the men's singles quarterfinal match against Florian Mayer of Germany in the Gerry Weber Open 2017 in Halle, Germany,
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