There have been theories thrown out there as to why Djokovic made his coaching decision, but seven-time major champion John McEnroe offered a pretty hilarious theory this weekend.

If Novak Djokovic can win a 25th major title in the coming days, he will bolster his claim to be considered the greatest athlete in history, according to his new coach Sir Andy Murray.

And Murray is confident more major silverware will follow for Novak Djokovic, who he thinks can establish himself as the best athlete of all time