He 's won the title in his past two appearances beating Tomas Berdych in 2014 and Novak Djokovic in 2015 before injury prevented him from competing last year .
Federer now returns to a happy hunting ground in Dubai where he has won seven titles in 12 appearances .
Federer 's won the title in Federer 's past two appearances beating Tomas Berdych in 2014 and Novak Djokovic in 2015 before injury prevented him from competing last year .
Federer now returns to a happy hunting ground in Dubai where he has won seven titles in 12 appearances .