That’s a wrap for the 2014 World Tour Finals: Federer injured, Djokovic is the champion

Ohhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh. The ATP season concluded in rather surreal fashion as Roger Federer was forced to pull out of Sunday’s final at the O2 with a back injury meaning that Novak Djokovic is the World Tour Finals champion for 2014.  Rumours were circling after Federer didn’t show for his practice session at 3pm.  After another brilliant…