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Novak Djokovic says it is "an incredible achievement" to end the year as world number one after beating Tomas Berdych at the ATP World Tour finals.
from BBC Sport - Sport http://bbc.in/1zVzV8F
Novak Djokovic says it is "an incredible achievement" to end the year as world number one after beating Tomas Berdych at the ATP World Tour finals.
from BBC Sport - Sport http://bbc.in/1zVzV8F
