Coach of tennis players like Serena Williams and Stefanos Tsitsipas, Patrick Mouratoglou said men's world number one Novak Djokovic was the "strongest" member of the Big 3 (Roger Federer, Rafael Nadal and Djokovic). "Djokovic is the best of the three...If the three are at the top of their game, he wins. History has told us that," he added.