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Alexander Zverev of Germany during the 2017 Australian Open at Melbourne Park, Australia. Credit: Frank Molter/Alamy Stock Photo - Alamy
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Angelique Kerber of Germany during the 2017 Australian Open at Melbourne Park, Australia Stock Photo - Alamy
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Angelique Kerber of Germany during the 2017 Australian Open at Melbourne Park, Australia Stock Photo - Alamy
![MELBOURNE, VIC - JANUARY 17: Florian Mayer of Germany returns the ball during the first round of the 2017 Australian Open on January 17, 2017, at Melbourne Park Tennis Centre in Melbourne, MELBOURNE, VIC - JANUARY 17: Florian Mayer of Germany returns the ball during the first round of the 2017 Australian Open on January 17, 2017, at Melbourne Park Tennis Centre in Melbourne,](https://c8.alamy.com/comp/2P0BPKD/melbourne-vic-january-17-florian-mayer-of-germany-returns-the-ball-during-the-first-round-of-the-2017-australian-open-on-january-17-2017-at-melbourne-park-tennis-centre-in-melbourne-australiaphoto-by-jason-heidrichicon-sportswire-icon-sportswire-via-ap-images-2P0BPKD.jpg)
MELBOURNE, VIC - JANUARY 17: Florian Mayer of Germany returns the ball during the first round of the 2017 Australian Open on January 17, 2017, at Melbourne Park Tennis Centre in Melbourne,
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Alexander Zverev of Germany during the 2017 Australian Open at Melbourne Park, Australia. Credit: Frank Molter/Alamy Stock Photo - Alamy
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Melbourne, Australia. 24th January 2017: Mischa Zverev (R) of Germany and Roger Federer from Switzerland at
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Melbourne, Australia. 21st Jan, 2017. Alexander Zverev of Germany is falling during his match against the spaniard Rafael Nadal at the 2017 Australian Open at Melbourne Park in Melbourne, Credit: Frank Molter/Alamy
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January 18, 2017: Angelique Kerber of Germany celebrates after winning a 2nd round match against Carina Witthoeft of Germany in the 2017 Australian Open Grand Slam tennis tournament in Melbourne, Australia. Sydney
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Johanna Konta of Germany hits a shot during her 4th round against Ekaterina makarova of Russia at Australian Open tennis tournament in Melbourne, Australia on Jan. 23, 2017. Konta won by 6-1,
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MELBOURNE, VIC - JANUARY 21: Alexander Zverev of Germany serves the ball during the third round of the 2017 Australian Open on January 21, 2017, at Melbourne Park Tennis Centre in Melbourne,
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Angelique Kerber of Germany during the 2017 Australian Open at Melbourne Park, Australia Stock Photo - Alamy
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