Djokovic has had great success in Australia, he's won it six times, and the way he finished last year it's hard not to say it'll be him, federer has positioned himself to have a good run. It's hard to pick.

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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