Novak Djokovic promotes Jannik Sinner to No.2 in the world ranking. Serbian says the South Tyrolean champion is the man to beat.
"At a certain point, I'm talking about the last 6 months, he was able to be more concrete, leave himself more margin, do fewer mistakes," he says. "It's sad to see that he's unable to return, in what could be his last season on the circuit," he adds of Rafael Nadal.