BBC Sport - ATP World Tour finals: Novak Djokovic gets angry with umpire

'You have no clue' Djokovic tells umpire

Novak Djokovic shares an angry exchange with umpire Fergus Murphy after the world number two receives a warning for taking longer than 20 seconds between serves during his win over David Goffin at the ATP World Tour finals.

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MATCH REPORT: ATP World Tour Finals: Djokovic beats Goffin

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