The Modern Grand Slam in golf is achieved by winning all four of golf's Major championships in the same calendar year. When the The Masters was founded, it started the "Modern Grand Slam". This is different from the PGA Grand Slam of Golf which refers to a tournament of all the winners of the four major championships.

It is so difficult due to the varying styles of courses and the level of competition at each one.

No golfer has ever acheived a modern Grand Slam. Tiger Woods has been the closest by winning all 4 consecutively, but over two calendar years. Bobby Jones won what would have been the "traditional Grand Slam" by winning all four major golf events of 1930.

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