Novak Djokovic joins Roger Federer 's coaching team . Will start work at next year American Open . Follows trend of star players recruiting former legends . Novak Djokovic to face Roger Federer 's in Federer final .
Stefan Edberg joins Roger Federer 's coaching team . Will start work at 2014 Australian Open . Follows trend of star players recruiting former legends . Novak Djokovic to face David Ferrer in Abu Dhabi final .