With three of the four Grand Slam titles and a record six Masters Series crowns scooped up in a year of domination, Novak Djokovic could be forgiven for using the ATP Tour Finals in London as a well-earned lap of honour.
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Barcelona's Lionel Messi broke free from Arsenal's shackles to score two late goals and put the Champions League holders on the brink of the quarter-finals with a clinical 2-0 victory at the Emirates Stadium on Tuesday.
