“So it was very impressive to see Medvedev coming back, going strong over five hours and competing. Those are the signs you want to see in a champion’s mentality of a player.
“So he is definitely in a small group of players that are getting closer and narrowing the gap to a Grand Slam title.”
Djokovic then name-checked three other players he believes have the capability of winning a Grand Slam as he expressed confidence in the emerging group of stars.
He added: “Alongside [Medvedev] is Dominic Thiem, who has been knocking on the door, and (Stefanos) Tsitsipas, who won a big title at the (ATP) Finals.