Novak Djokovic knows that his chances of winning the 25th Grand Slam title of his legendary career are very much linked to the progress of this season. The former world number 1 is about to turn 38 and is perfectly aware that it will be increasingly difficult to compete against opponents much younger than him in best-of-five set matches.

Nick Kyrgios' career, at least in singles. The Australian ace has always said his career would not be very long and the injuries that have affected him in the last two years have greatly reduced his competitiveness.