Photos show what golf's biggest stars looked like when their careers started

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Rory McIlroy

Ahmed Jadallah/Reuters

Many of the world's greatest golfers turn pro as teenagers and grow up right before our eyes.

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Yet, down the road, it is easy to forget just how much many of these golfers have changed since they started their pro careers, and how much better their fashion sense has become.

Below we take a look at what guys like Phil Mickelson, Dustin Johnson, Jordan Spieth, and Jason Day looked like before they were famous.