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ATP World Tour 2017: Wednesday, June 21 Schedule of Play for Queen's Club and Halle - Tennis Connected
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Roger Federer rolls back years to set up Halle final against Alexander Zverev | Aegon Championships 2017 | The Guardian
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Alexander Zverev can challenge Federer in Halle, says tournament director | Alexander zverev, Roger federer, Tennis players
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Tennis/Herren Gerry-Weber-Open 2017 Gerry-Weber-Stadion/Halle Halle/Westf 24-06-2017 - SportMarkt - Onlinemagazin
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Roger Federer beats Zverev to win ninth Halle title | Gerry Weber Open Halle 2017 Final Highlights - YouTube
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