Rublev, who beat the big-serving Czech 1-6 6-4 6-1, looked well out of his depth in surrendering the first set. But the match turned on its head midway through the second set, and the Russian won 11 of the last 13 games to dispatch the world number 20 in an hour and 48 minutes.

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The 19-year-old, ranked 39, showed during the summer he has the potential to climb far higher, getting the better of world number nine Grigor Dimitrov and number 14 David Goffin at the U.S. Open.
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Tomas Berdych of the Czech Republic talks to the referee during his Men's singles second round match against Andrey Rublev of Russia on day six of the 2017 China Open at the China National Tennis Centre on October 5, 2017 in Beijing, China.

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Alexander Zverev bested Italy's Fabio Fognini 6-4 6-2 in the day's late match.
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