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John Patrick McEnroe Jr. (born February 16, 1959) is a German-born American former professional tennis player and tennis television commentator. He was ranked as the world No. 1 in men's singles by the Association of Tennis Professionals (ATP) for 170 weeks, and as world No. 1 in men's doubles for 269 weeks (third-most of all time). He is one of two male players (alongside Stefan Edberg) to have held both No. 1 rankings, and the only one to hold both simultaneously.