Former world No.1 John McEnroe believes Andy Murray will add to his grand slam tally next year but may have missed a trick by failing to stamp his authority on his rivals at the end of 2012.
Murray's victory over Novak Djokovic at the US Open in September broke his grand slam duck and made him the first British man to win a major singles title for 76 years.
McEnroe, who watched every one of Murray's matches on his way to glory in New York, believes how the Scot reacts to the tight defeats by world No.1 Djokovic in the last two months of the year could have a bearing on his fortunes in 2013.
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