Why Is the Diameter of the Golf Cup 4 1/4 Inches? The diameter of the golf cup evolved purely by chance. "Two golfers on the St. Andrews links found that one hole was so badly worn that they could not use it. Much of its sand had been removed by previous players for building tees. Anxious to repair the damage and continue their game, they looked around and discovered nearby part of an old drainpipe. They inserted this in the hole. It was the 1st 'cup,' and because it happened to measure 4 1/4" across, all cups are now that size."
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