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Phil Mickelson Explains the Physics Behind His Laser-Guided Wedge Play

Mickelson says he builds references with his irons, grooving a 145-yard 9-iron and then adjusting for temperature, altitude, lie, grain and moisture. He notes zoysia or a tee adds five yards, choking down an inch or one degree of loft changes distance by three. Hitting 1,500 balls a month helps him stay precise within one or two yards.