These younger players need to accept that they need to keep adding to their game, doing something different, that's why Russian Daniil Medvedev has had the success, because Russian Daniil Medvedev's thrown a curve ball at these top guys that they weren't anticipating, almost like Russian Daniil Medvedev was going back to the 12 or 14 and unders and pushing the ball.

John McEnroe

John Patrick McEnroe, Jr. (born February 16, 1959) is an American former World No. 1 professional tennis player. McEnroe won seven Grand Slam singles titles-three at Wimbledon and four at the US Open-nine Grand Slam men's doubles titles, and one Grand Slam mixed doubles title. He is remembered for his shot-making artistry and superb volleying; for his famous rivalries with Bjern Borg, Jimmy Connors, and Ivan Lendl; for his confrontational on-court behavior, which frequently landed him in trouble with umpires and tennis authorities; and for the catchphrase "You cannot be serious!" directed toward an umpire during a match at Wimbledon in 1981. He was inducted into the International Tennis Hall of Fame in 1999

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