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. 2014 Apr;48(Suppl 1):i7–i11. doi: 10.1136/bjsports-2013-093196

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

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Hawkeye data of the Djokovic-Nadal Australian Open 2012 final. The heat map illustrates the difficulty in determining appropriately sensitive measures of fatigue based on movement patterns in match-play tennis.