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Golf is a precision club-and-ball sport in which golfers, using many types of clubs, attempt to hit balls into each hole on a golf course (consists of either nine or 18 holes) while employing the fewest number of strokes. Golf is defined as, "playing a ball with a club from the teeing ground into the hole by a stroke or successive strokes in accordance with the Rules". Golf's four most prestigious men's tournaments of the year are: The Masters, the U.S. Open, The Open Championship (referred to in North America as the British Open) and the PGA Championship.