Novak Djokovic has hired a new coach -- longtime friend and rival Andy Murray, who retired from competitive tennis this summer. Djokovic split with coach Goran Ivanisevic after six years earlier this summer, and he's counting on Murray to help him ...

Tennis superstar Novak Djokovic has a new coach who knows his game better than just about anyone else—his longtime rival Andy Murray. The Serbian announced that he was teaming up with his fellow one-time world No.

Novak Djokovic launched his career in the shadow of Roger Federer and Rafael Nadal but has surpassed them both and is widely considered the greatest player of all time.