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Stuttgart, Germany. 14th June, 2017. Switzerland's Roger Federer serves during a 2nd round match of Mercedes Cup tennis tournament with Germany's Tommy Haas in Stuttgart, Germany, on June 14, 2017. Roger Federer
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![Live Tennis on Twitter: "✓ Halle 2017 ✓ Wimbledon 2017 ✓ Stuttgart 2018 Roger #Federer brings a 17-match grass-court winning streak into today's clash with Benoit #Paire >>> https://t.co/kOljmegCUv https://t.co/hN651yczkC" / Twitter Live Tennis on Twitter: "✓ Halle 2017 ✓ Wimbledon 2017 ✓ Stuttgart 2018 Roger #Federer brings a 17-match grass-court winning streak into today's clash with Benoit #Paire >>> https://t.co/kOljmegCUv https://t.co/hN651yczkC" / Twitter](https://pbs.twimg.com/media/DgJZyBTX4AEMv2i.jpg:large)