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What do we know about 'Sascha'? - Get to know ATP finals champion Alexander Zverev (VIDEO)

Alexander Zverev has been hailed as "the next big thing" in tennis after winning the ATP Finals in London. But what do we know about the 21-year-old German? RT Sport gives you the rundown on the young man they call 'Sascha'.

READ MORE: A star is born: Zverev beats Djokovic in straight sets to clinch ATP Finals (PHOTOS)

Not only did Zverev beat all-time tennis greats Roger Federer and Novak Djokovic in the semifinal and final respectively, he did it in style: defeating two of the greatest to ever play the game in straight sets, earning an array of plaudits along the way.

German tennis icon Boris Becker went as far as to label Zverev "the best of his generation" and acclaimed his stunning upset over Serbian Djokovic "a moment which the whole tennis world has been waiting for."

Here, RT Sport explains what all the fuss is about over 'Sascha'.

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