The world number one appears to be in prime form heading into the Australian Open
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Matteo Berrettini led the way for Team Italy
The Ecuadorian defeated the 41-year-old on Sunday
The Russian defeated Rafael Nadal and Novak Djokovic on his way to the crown.
The Russian qualifies for the ATP year-end finals with the win.
It is the Serb’s first time competing here since 2007
In a match of ebbs and flows, it was the American who came out on top
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